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人気のある三角関数 >

sin(x/2)=1-sin(x/2)

解

sin (\frac{x}{2}) = 1 - sin (\frac{x}{2})

解

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

+1

度

x = 6 0^{\circ} + 72 0^{\circ} n, x = 30 0^{\circ} + 72 0^{\circ} n

解答ステップ

sin (\frac{x}{2}) = 1 - sin (\frac{x}{2})

置換で解く

sin (\frac{x}{2}) = 1 - sin (\frac{x}{2})

仮定:

sin (\frac{x}{2}) = u

u = 1 - u

u = 1 - u : u = \frac{1}{2}

u = 1 - u

u

を左側に移動します

u = 1 - u

両辺に

u

を足す

u + u = 1 - u + u

簡素化

2 u = 1

2 u = 1

以下で両辺を割る

2

2 u = 1

以下で両辺を割る

2

\frac{2 u}{2} = \frac{1}{2}

簡素化

u = \frac{1}{2}

u = \frac{1}{2}

代用を戻す

u = sin (\frac{x}{2})

sin (\frac{x}{2}) = \frac{1}{2}

sin (\frac{x}{2}) = \frac{1}{2}

sin (\frac{x}{2}) = \frac{1}{2} : x = \frac{π}{3} + 4 πn, x = \frac{5 π}{3} + 4 πn

sin (\frac{x}{2}) = \frac{1}{2}

以下の一般解

sin (\frac{x}{2}) = \frac{1}{2}

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}

\frac{x}{2} = \frac{π}{6} + 2 πn, \frac{x}{2} = \frac{5 π}{6} + 2 πn

\frac{x}{2} = \frac{π}{6} + 2 πn, \frac{x}{2} = \frac{5 π}{6} + 2 πn

解く

\frac{x}{2} = \frac{π}{6} + 2 πn : x = \frac{π}{3} + 4 πn

\frac{x}{2} = \frac{π}{6} + 2 πn

以下で両辺を乗じる:

2

\frac{x}{2} = \frac{π}{6} + 2 πn

以下で両辺を乗じる:

2

\frac{2 x}{2} = 2 \cdot \frac{π}{6} + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} = 2 \cdot \frac{π}{6} + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} : x

\frac{2 x}{2}

数を割る:

\frac{2}{2} = 1

= x

簡素化

2 \cdot \frac{π}{6} + 2 \cdot 2 πn : \frac{π}{3} + 4 πn

2 \cdot \frac{π}{6} + 2 \cdot 2 πn

2 \cdot \frac{π}{6} = \frac{π}{3}

2 \cdot \frac{π}{6}

分数を乗じる:

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

= \frac{π 2}{6}

共通因数を約分する:

2

= \frac{π}{3}

2 \cdot 2 πn = 4 πn

2 \cdot 2 πn

数を乗じる:

2 \cdot 2 = 4

= 4 πn

= \frac{π}{3} + 4 πn

x = \frac{π}{3} + 4 πn

x = \frac{π}{3} + 4 πn

x = \frac{π}{3} + 4 πn

解く

\frac{x}{2} = \frac{5 π}{6} + 2 πn : x = \frac{5 π}{3} + 4 πn

\frac{x}{2} = \frac{5 π}{6} + 2 πn

以下で両辺を乗じる:

2

\frac{x}{2} = \frac{5 π}{6} + 2 πn

以下で両辺を乗じる:

2

\frac{2 x}{2} = 2 \cdot \frac{5 π}{6} + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} = 2 \cdot \frac{5 π}{6} + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} : x

\frac{2 x}{2}

数を割る:

\frac{2}{2} = 1

= x

簡素化

2 \cdot \frac{5 π}{6} + 2 \cdot 2 πn : \frac{5 π}{3} + 4 πn

2 \cdot \frac{5 π}{6} + 2 \cdot 2 πn

2 \cdot \frac{5 π}{6} = \frac{5 π}{3}

2 \cdot \frac{5 π}{6}

分数を乗じる:

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

= \frac{5 π 2}{6}

数を乗じる:

5 \cdot 2 = 10

= \frac{10 π}{6}

共通因数を約分する:

2

= \frac{5 π}{3}

2 \cdot 2 πn = 4 πn

2 \cdot 2 πn

数を乗じる:

2 \cdot 2 = 4

= 4 πn

= \frac{5 π}{3} + 4 πn

x = \frac{5 π}{3} + 4 πn

x = \frac{5 π}{3} + 4 πn

x = \frac{5 π}{3} + 4 πn

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

すべての解を組み合わせる

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

グラフ

人気の例

4 cos^{2} (θ) - 1 = 0

sinh (x) = 1

(sin(2x)+cos(2x))^2=1

(sin (2 x) + cos (2 x))^{2} = 1

2sin^2(x)-sin(x)=1

2 sin^{2} (x) - sin (x) = 1

cos^2(x)-sin^2(x)= 1/2

cos^{2} (x) - sin^{2} (x) = \frac{1}{2}