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人気のある三角関数 >

sin^2(2x)=2sin^2(x)

解

sin^{2} (2 x) = 2 sin^{2} (x)

解

x = 2 πn, x = π + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn, x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

+1

度

x = 0^{\circ} + 36 0^{\circ} n, x = 18 0^{\circ} + 36 0^{\circ} n, x = 13 5^{\circ} + 36 0^{\circ} n, x = 22 5^{\circ} + 36 0^{\circ} n, x = 4 5^{\circ} + 36 0^{\circ} n, x = 31 5^{\circ} + 36 0^{\circ} n

解答ステップ

sin^{2} (2 x) = 2 sin^{2} (x)

両辺から

2 sin^{2} (x)

を引く

sin^{2} (2 x) - 2 sin^{2} (x) = 0

因数

sin^{2} (2 x) - 2 sin^{2} (x) : (sin (2 x) + 2 sin (x)) (sin (2 x) - 2 sin (x))

sin^{2} (2 x) - 2 sin^{2} (x)

sin^{2} (2 x) - 2 sin^{2} (x)

を書き換え

sin^{2} (2 x) - (2 sin (x))^{2}

sin^{2} (2 x) - 2 sin^{2} (x)

累乗根の規則を適用する:

a = (a)^{2}

2 = (2)^{2}

= sin^{2} (2 x) - (2)^{2} sin^{2} (x)

指数の規則を適用する:

a^{m} b^{m} = (ab)^{m}

(2)^{2} sin^{2} (x) = (2 sin (x))^{2}

= sin^{2} (2 x) - (2 sin (x))^{2}

= sin^{2} (2 x) - (2 sin (x))^{2}

2乗の差の公式を適用する:

x^{2} - y^{2} = (x + y) (x - y)

sin^{2} (2 x) - (2 sin (x))^{2} = (sin (2 x) + 2 sin (x)) (sin (2 x) - 2 sin (x))

= (sin (2 x) + 2 sin (x)) (sin (2 x) - 2 sin (x))

(sin (2 x) + 2 sin (x)) (sin (2 x) - 2 sin (x)) = 0

各部分を別個に解く

sin (2 x) + 2 sin (x) = 0 or sin (2 x) - 2 sin (x) = 0

sin (2 x) + 2 sin (x) = 0 : x = 2 πn, x = π + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

sin (2 x) + 2 sin (x) = 0

三角関数の公式を使用して書き換える

sin (2 x) + sin (x) 2

2倍角の公式を使用:

sin (2 x) = 2 sin (x) cos (x)

= 2 sin (x) cos (x) + 2 sin (x)

sin (x) 2 + 2 cos (x) sin (x) = 0

因数

sin (x) 2 + 2 cos (x) sin (x) : sin (x) (2 + 2 cos (x))

sin (x) 2 + 2 cos (x) sin (x)

共通項をくくり出す

sin (x)

= sin (x) (2 + 2 cos (x))

sin (x) (2 + 2 cos (x)) = 0

各部分を別個に解く

sin (x) = 0 or 2 + 2 cos (x) = 0

sin (x) = 0 : x = 2 πn, x = π + 2 πn

sin (x) = 0

以下の一般解

sin (x) = 0

sin (x)

2 πn

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} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{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} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn, x = π + 2 πn

解く

x = 0 + 2 πn : x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn, x = π + 2 πn

2 + 2 cos (x) = 0 : x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

2 + 2 cos (x) = 0

2

を右側に移動します

2 + 2 cos (x) = 0

両辺から

2

を引く

2 + 2 cos (x) - 2 = 0 - 2

簡素化

2 cos (x) = - 2

2 cos (x) = - 2

以下で両辺を割る

2

2 cos (x) = - 2

以下で両辺を割る

2

\frac{2 cos ( x )}{2} = \frac{- 2}{2}

簡素化

cos (x) = - \frac{2}{2}

cos (x) = - \frac{2}{2}

以下の一般解

cos (x) = - \frac{2}{2}

cos (x)

2 πn

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}

x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

すべての解を組み合わせる

x = 2 πn, x = π + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

sin (2 x) - 2 sin (x) = 0 : x = 2 πn, x = π + 2 πn, x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

sin (2 x) - 2 sin (x) = 0

三角関数の公式を使用して書き換える

sin (2 x) - sin (x) 2

2倍角の公式を使用:

sin (2 x) = 2 sin (x) cos (x)

= 2 sin (x) cos (x) - 2 sin (x)

- sin (x) 2 + 2 cos (x) sin (x) = 0

因数

- sin (x) 2 + 2 cos (x) sin (x) : sin (x) (- 2 + 2 cos (x))

- sin (x) 2 + 2 cos (x) sin (x)

共通項をくくり出す

sin (x)

= sin (x) (- 2 + 2 cos (x))

sin (x) (- 2 + 2 cos (x)) = 0

各部分を別個に解く

sin (x) = 0 or - 2 + 2 cos (x) = 0

sin (x) = 0 : x = 2 πn, x = π + 2 πn

sin (x) = 0

以下の一般解

sin (x) = 0

sin (x)

2 πn

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} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{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} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn, x = π + 2 πn

解く

x = 0 + 2 πn : x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn, x = π + 2 πn

- 2 + 2 cos (x) = 0 : x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

- 2 + 2 cos (x) = 0

2

を右側に移動します

- 2 + 2 cos (x) = 0

両辺に

2

を足す

- 2 + 2 cos (x) + 2 = 0 + 2

簡素化

2 cos (x) = 2

2 cos (x) = 2

以下で両辺を割る

2

2 cos (x) = 2

以下で両辺を割る

2

\frac{2 cos ( x )}{2} = \frac{2}{2}

簡素化

cos (x) = \frac{2}{2}

cos (x) = \frac{2}{2}

以下の一般解

cos (x) = \frac{2}{2}

cos (x)

2 πn

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}

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

すべての解を組み合わせる

x = 2 πn, x = π + 2 πn, x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

すべての解を組み合わせる

x = 2 πn, x = π + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn, x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

グラフ

人気の例

2cos(x)+2sin(x)=0

2 cos (x) + 2 sin (x) = 0

(sqrt(3))/2 =sin(arcsin(0)+c_{1})

\frac{3}{2} = sin (arcsin (0) + c_{1})

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