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人気のある三角関数 >

tan(x+20)*tan(x-20)=1

解

tan (x + 2 0^{\circ}) \cdot tan (x - 2 0^{\circ}) = 1

解

x = 4 5^{\circ} + 18 0^{\circ} n, x = 13 5^{\circ} + 18 0^{\circ} n

+1

ラジアン

x = \frac{π}{4} + πn, x = \frac{3 π}{4} + πn

解答ステップ

tan (x + 2 0^{\circ}) tan (x - 2 0^{\circ}) = 1

両辺から

1

を引く

tan (x + 2 0^{\circ}) tan (x - 2 0^{\circ}) - 1 = 0

簡素化

tan (x + 2 0^{\circ}) tan (x - 2 0^{\circ}) - 1 : tan (\frac{9 x + 18 0 ^{\circ}}{9}) tan (\frac{9 x - 18 0 ^{\circ}}{9}) - 1

tan (x + 2 0^{\circ}) tan (x - 2 0^{\circ}) - 1

tan (x + 2 0^{\circ}) tan (x - 2 0^{\circ}) = tan (\frac{9 x + 18 0 ^{\circ}}{9}) tan (\frac{9 x - 18 0 ^{\circ}}{9})

tan (x + 2 0^{\circ}) tan (x - 2 0^{\circ})

結合

x + 2 0^{\circ} : \frac{9 x + 18 0 ^{\circ}}{9}

x + 2 0^{\circ}

元を分数に変換する:

x = \frac{x 9}{9}

= \frac{x \cdot 9}{9} + 2 0^{\circ}

分母が等しいので, 分数を組み合わせる:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{x \cdot 9 + 18 0 ^{\circ}}{9}

= tan (\frac{9 x + 18 0 ^{\circ}}{9}) tan (x - 2 0^{\circ})

結合

x - 2 0^{\circ} : \frac{9 x - 18 0 ^{\circ}}{9}

x - 2 0^{\circ}

元を分数に変換する:

x = \frac{x 9}{9}

= \frac{x \cdot 9}{9} - 2 0^{\circ}

分母が等しいので, 分数を組み合わせる:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{x \cdot 9 - 18 0 ^{\circ}}{9}

= tan (\frac{9 x + 18 0 ^{\circ}}{9}) tan (\frac{9 x - 18 0 ^{\circ}}{9})

= tan (\frac{9 x + 18 0 ^{\circ}}{9}) tan (\frac{9 x - 18 0 ^{\circ}}{9}) - 1

tan (\frac{9 x + 18 0 ^{\circ}}{9}) tan (\frac{9 x - 18 0 ^{\circ}}{9}) - 1 = 0

サイン, コサインで表わす

- 1 + tan (\frac{- 18 0 ^{\circ} + 9 x}{9}) tan (\frac{18 0 ^{\circ} + 9 x}{9})

基本的な三角関数の公式を使用する:

tan (x) = \frac{sin ( x )}{cos ( x )}

= - 1 + \frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} )} tan (\frac{18 0 ^{\circ} + 9 x}{9})

基本的な三角関数の公式を使用する:

tan (x) = \frac{sin ( x )}{cos ( x )}

= - 1 + \frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} )} \cdot \frac{sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

簡素化

- 1 + \frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} )} \cdot \frac{sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{18 0 ^{\circ} + 9 x}{9} )} : \frac{- cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} ) + sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

- 1 + \frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} )} \cdot \frac{sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

乗じる

\frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} )} \cdot \frac{sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{18 0 ^{\circ} + 9 x}{9} )} : \frac{sin ( \frac{9 x - 18 0 ^{\circ}}{9} ) sin ( \frac{9 x + 18 0 ^{\circ}}{9} )}{cos ( \frac{9 x - 18 0 ^{\circ}}{9} ) cos ( \frac{9 x + 18 0 ^{\circ}}{9} )}

\frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} )} \cdot \frac{sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

分数を乗じる:

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

= \frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

= - 1 + \frac{sin ( \frac{9 x - 18 0 ^{\circ}}{9} ) sin ( \frac{9 x + 18 0 ^{\circ}}{9} )}{cos ( \frac{9 x - 18 0 ^{\circ}}{9} ) cos ( \frac{9 x + 18 0 ^{\circ}}{9} )}

元を分数に変換する:

1 = \frac{1 cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

= - \frac{1 \cdot cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )} + \frac{sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

分母が等しいので, 分数を組み合わせる:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- 1 \cdot cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} ) + sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

乗算:

1 \cdot cos (\frac{- 18 0 ^{\circ} + 9 x}{9}) = cos (\frac{- 18 0 ^{\circ} + 9 x}{9})

= \frac{- cos ( \frac{9 x - 18 0 ^{\circ}}{9} ) cos ( \frac{9 x + 18 0 ^{\circ}}{9} ) + sin ( \frac{9 x - 18 0 ^{\circ}}{9} ) sin ( \frac{9 x + 18 0 ^{\circ}}{9} )}{cos ( \frac{9 x - 18 0 ^{\circ}}{9} ) cos ( \frac{9 x + 18 0 ^{\circ}}{9} )}

= \frac{- cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} ) + sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )}

\frac{- cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} ) + sin ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) sin ( \frac{18 0 ^{\circ} + 9 x}{9} )}{cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} ) cos ( \frac{18 0 ^{\circ} + 9 x}{9} )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

- cos (\frac{- 18 0 ^{\circ} + 9 x}{9}) cos (\frac{18 0 ^{\circ} + 9 x}{9}) + sin (\frac{- 18 0 ^{\circ} + 9 x}{9}) sin (\frac{18 0 ^{\circ} + 9 x}{9}) = 0

三角関数の公式を使用して書き換える

- cos (\frac{- 18 0 ^{\circ} + 9 x}{9}) cos (\frac{18 0 ^{\circ} + 9 x}{9}) + sin (\frac{- 18 0 ^{\circ} + 9 x}{9}) sin (\frac{18 0 ^{\circ} + 9 x}{9})

角の和の公式を使用する:

cos (s) cos (t) - sin (s) sin (t) = cos (s + t)

- cos (s) cos (t) + sin (s) sin (t) = - cos (s + t)

= - cos (\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9})

- cos (\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9}) = 0

以下で両辺を割る

- 1

- cos (\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9}) = 0

以下で両辺を割る

- 1

\frac{- cos ( \frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} )}{- 1} = \frac{0}{- 1}

簡素化

cos (\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9}) = 0

cos (\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9}) = 0

以下の一般解

cos (\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9}) = 0

cos (x)

36 0^{\circ} n

循環を含む周期性テーブル:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 9 0^{\circ} + 36 0^{\circ} n, \frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 27 0^{\circ} + 36 0^{\circ} n

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 9 0^{\circ} + 36 0^{\circ} n, \frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 27 0^{\circ} + 36 0^{\circ} n

解く

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 9 0^{\circ} + 36 0^{\circ} n : x = 4 5^{\circ} + 18 0^{\circ} n

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 9 0^{\circ} + 36 0^{\circ} n

以下で両辺を乗じる:

9

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 9 0^{\circ} + 36 0^{\circ} n

以下で両辺を乗じる:

9

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9 + \frac{18 0 ^{\circ} + 9 x}{9} \cdot 9 = 9 0^{\circ} \cdot 9 + 36 0^{\circ} n \cdot 9

簡素化

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9 + \frac{18 0 ^{\circ} + 9 x}{9} \cdot 9 = 9 0^{\circ} \cdot 9 + 36 0^{\circ} n \cdot 9

簡素化

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9 : - 18 0^{\circ} + 9 x

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( - 18 0 ^{\circ} + 9 x ) \cdot 9}{9}

共通因数を約分する:

9

= - - 18 0^{\circ} + 9 x

簡素化

\frac{18 0 ^{\circ} + 9 x}{9} \cdot 9 : 18 0^{\circ} + 9 x

\frac{18 0 ^{\circ} + 9 x}{9} \cdot 9

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( 18 0 ^{\circ} + 9 x ) \cdot 9}{9}

共通因数を約分する:

9

= 18 0^{\circ} + 9 x

簡素化

9 0^{\circ} \cdot 9 : 81 0^{\circ}

9 0^{\circ} \cdot 9

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= 81 0^{\circ}

簡素化

36 0^{\circ} n \cdot 9 : 324 0^{\circ} n

36 0^{\circ} n \cdot 9

数を乗じる:

2 \cdot 9 = 18

= 324 0^{\circ} n

- 18 0^{\circ} + 9 x + 18 0^{\circ} + 9 x = 81 0^{\circ} + 324 0^{\circ} n

18 x = 81 0^{\circ} + 324 0^{\circ} n

18 x = 81 0^{\circ} + 324 0^{\circ} n

18 x = 81 0^{\circ} + 324 0^{\circ} n

以下で両辺を割る

18

18 x = 81 0^{\circ} + 324 0^{\circ} n

以下で両辺を割る

18

\frac{18 x}{18} = \frac{81 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18}

簡素化

\frac{18 x}{18} = \frac{81 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18}

簡素化

\frac{18 x}{18} : x

\frac{18 x}{18}

数を割る:

\frac{18}{18} = 1

= x

簡素化

\frac{81 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18} : 4 5^{\circ} + 18 0^{\circ} n

\frac{81 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18}

\frac{81 0 ^{\circ}}{18} = 4 5^{\circ}

\frac{81 0 ^{\circ}}{18}

分数の規則を適用する:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{162 0 ^{\circ}}{2 \cdot 18}

数を乗じる:

2 \cdot 18 = 36

= 4 5^{\circ}

共通因数を約分する:

9

= 4 5^{\circ}

\frac{324 0 ^{\circ} n}{18} = 18 0^{\circ} n

\frac{324 0 ^{\circ} n}{18}

数を割る:

\frac{18}{18} = 1

= 18 0^{\circ} n

= 4 5^{\circ} + 18 0^{\circ} n

x = 4 5^{\circ} + 18 0^{\circ} n

x = 4 5^{\circ} + 18 0^{\circ} n

x = 4 5^{\circ} + 18 0^{\circ} n

解く

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 27 0^{\circ} + 36 0^{\circ} n : x = 13 5^{\circ} + 18 0^{\circ} n

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 27 0^{\circ} + 36 0^{\circ} n

以下で両辺を乗じる:

9

\frac{- 18 0 ^{\circ} + 9 x}{9} + \frac{18 0 ^{\circ} + 9 x}{9} = 27 0^{\circ} + 36 0^{\circ} n

以下で両辺を乗じる:

9

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9 + \frac{18 0 ^{\circ} + 9 x}{9} \cdot 9 = 27 0^{\circ} \cdot 9 + 36 0^{\circ} n \cdot 9

簡素化

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9 + \frac{18 0 ^{\circ} + 9 x}{9} \cdot 9 = 27 0^{\circ} \cdot 9 + 36 0^{\circ} n \cdot 9

簡素化

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9 : - 18 0^{\circ} + 9 x

\frac{- 18 0 ^{\circ} + 9 x}{9} \cdot 9

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( - 18 0 ^{\circ} + 9 x ) \cdot 9}{9}

共通因数を約分する:

9

= - - 18 0^{\circ} + 9 x

簡素化

\frac{18 0 ^{\circ} + 9 x}{9} \cdot 9 : 18 0^{\circ} + 9 x

\frac{18 0 ^{\circ} + 9 x}{9} \cdot 9

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( 18 0 ^{\circ} + 9 x ) \cdot 9}{9}

共通因数を約分する:

9

= 18 0^{\circ} + 9 x

簡素化

27 0^{\circ} \cdot 9 : 243 0^{\circ}

27 0^{\circ} \cdot 9

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= 243 0^{\circ}

数を乗じる:

3 \cdot 9 = 27

= 243 0^{\circ}

簡素化

36 0^{\circ} n \cdot 9 : 324 0^{\circ} n

36 0^{\circ} n \cdot 9

数を乗じる:

2 \cdot 9 = 18

= 324 0^{\circ} n

- 18 0^{\circ} + 9 x + 18 0^{\circ} + 9 x = 243 0^{\circ} + 324 0^{\circ} n

18 x = 243 0^{\circ} + 324 0^{\circ} n

18 x = 243 0^{\circ} + 324 0^{\circ} n

18 x = 243 0^{\circ} + 324 0^{\circ} n

以下で両辺を割る

18

18 x = 243 0^{\circ} + 324 0^{\circ} n

以下で両辺を割る

18

\frac{18 x}{18} = \frac{243 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18}

簡素化

\frac{18 x}{18} = \frac{243 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18}

簡素化

\frac{18 x}{18} : x

\frac{18 x}{18}

数を割る:

\frac{18}{18} = 1

= x

簡素化

\frac{243 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18} : 13 5^{\circ} + 18 0^{\circ} n

\frac{243 0 ^{\circ}}{18} + \frac{324 0 ^{\circ} n}{18}

\frac{243 0 ^{\circ}}{18} = 13 5^{\circ}

\frac{243 0 ^{\circ}}{18}

分数の規則を適用する:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{486 0 ^{\circ}}{2 \cdot 18}

数を乗じる:

2 \cdot 18 = 36

= 13 5^{\circ}

共通因数を約分する:

9

= 13 5^{\circ}

\frac{324 0 ^{\circ} n}{18} = 18 0^{\circ} n

\frac{324 0 ^{\circ} n}{18}

数を割る:

\frac{18}{18} = 1

= 18 0^{\circ} n

= 13 5^{\circ} + 18 0^{\circ} n

x = 13 5^{\circ} + 18 0^{\circ} n

x = 13 5^{\circ} + 18 0^{\circ} n

x = 13 5^{\circ} + 18 0^{\circ} n

x = 4 5^{\circ} + 18 0^{\circ} n, x = 13 5^{\circ} + 18 0^{\circ} n

グラフ

人気の例

18cos(10x)+2=10

18 cos (10 x) + 2 = 10

cos(2θ)=sin(2θ)

cos (2 θ) = sin (2 θ)

2cos(x/2)=sqrt(3)

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tan(x)(cot(x)-(sqrt(3))/3)=0

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