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人気のある三角関数 >

sin^2(a)=1-cos(2a)

解

sin^{2} (a) = 1 - cos (2 a)

解

a = 2 πn, a = π + 2 πn

+1

度

a = 0^{\circ} + 36 0^{\circ} n, a = 18 0^{\circ} + 36 0^{\circ} n

解答ステップ

sin^{2} (a) = 1 - cos (2 a)

両辺から

1 - cos (2 a)

を引く

sin^{2} (a) - 1 + cos (2 a) = 0

三角関数の公式を使用して書き換える

- 1 + cos (2 a) + sin^{2} (a)

2倍角の公式を使用:

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

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

= - 1 + cos (2 a) - (cos (2 a) - cos^{2} (a))

簡素化

- 1 + cos (2 a) - (cos (2 a) - cos^{2} (a)) : - 1 + cos^{2} (a)

- 1 + cos (2 a) - (cos (2 a) - cos^{2} (a))

- (cos (2 a) - cos^{2} (a)) : - cos (2 a) + cos^{2} (a)

- (cos (2 a) - cos^{2} (a))

括弧を分配する

= - (cos (2 a)) - (- cos^{2} (a))

マイナス・プラスの規則を適用する

- (- a) = a, - (a) = - a

= - cos (2 a) + cos^{2} (a)

= - 1 + cos (2 a) - cos (2 a) + cos^{2} (a)

類似した元を足す:

cos (2 a) - cos (2 a) = 0

= - 1 + cos^{2} (a)

= - 1 + cos^{2} (a)

- 1 + cos^{2} (a) = 0

置換で解く

- 1 + cos^{2} (a) = 0

仮定:

cos (a) = u

- 1 + u^{2} = 0

- 1 + u^{2} = 0 : u = 1, u = - 1

- 1 + u^{2} = 0

1

を右側に移動します

- 1 + u^{2} = 0

両辺に

1

を足す

- 1 + u^{2} + 1 = 0 + 1

簡素化

u^{2} = 1

u^{2} = 1

x^{2} = f (a)

の場合, 解は

x = f (a), - f (a)

u = 1, u = - 1

1 = 1

1

規則を適用

1 = 1

= 1

- 1 = - 1

- 1

規則を適用

1 = 1

= - 1

u = 1, u = - 1

代用を戻す

u = cos (a)

cos (a) = 1, cos (a) = - 1

cos (a) = 1, cos (a) = - 1

cos (a) = 1 : a = 2 πn

cos (a) = 1

以下の一般解

cos (a) = 1

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}

a = 0 + 2 πn

a = 0 + 2 πn

解く

a = 0 + 2 πn : a = 2 πn

a = 0 + 2 πn

0 + 2 πn = 2 πn

a = 2 πn

a = 2 πn

cos (a) = - 1 : a = π + 2 πn

cos (a) = - 1

以下の一般解

cos (a) = - 1

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}

a = π + 2 πn

a = π + 2 πn

すべての解を組み合わせる

a = 2 πn, a = π + 2 πn

グラフ

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