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人気のある三角関数 >

sec(x)tan(x)-cos(x)cot(x)=sin(x)

解

sec (x) tan (x) - cos (x) cot (x) = sin (x)

解

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

+1

度

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

解答ステップ

sec (x) tan (x) - cos (x) cot (x) = sin (x)

両辺から

sin (x)

を引く

sec (x) tan (x) - cos (x) cot (x) - sin (x) = 0

サイン, コサインで表わす

- sin (x) - cos (x) cot (x) + sec (x) tan (x)

基本的な三角関数の公式を使用する:

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

= - sin (x) - cos (x) \frac{cos ( x )}{sin ( x )} + sec (x) tan (x)

基本的な三角関数の公式を使用する:

sec (x) = \frac{1}{cos ( x )}

= - sin (x) - cos (x) \frac{cos ( x )}{sin ( x )} + \frac{1}{cos ( x )} tan (x)

基本的な三角関数の公式を使用する:

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

= - sin (x) - cos (x) \frac{cos ( x )}{sin ( x )} + \frac{1}{cos ( x )} \cdot \frac{sin ( x )}{cos ( x )}

簡素化

- sin (x) - cos (x) \frac{cos ( x )}{sin ( x )} + \frac{1}{cos ( x )} \cdot \frac{sin ( x )}{cos ( x )} : \frac{- cos ^{2} ( x ) sin ^{2} ( x ) - cos ^{4} ( x ) + sin ^{2} ( x )}{cos ^{2} ( x ) sin ( x )}

- sin (x) - cos (x) \frac{cos ( x )}{sin ( x )} + \frac{1}{cos ( x )} \cdot \frac{sin ( x )}{cos ( x )}

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

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

分数を乗じる:

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

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

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

cos (x) cos (x)

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

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

= cos^{1 + 1} (x)

数を足す:

1 + 1 = 2

= cos^{2} (x)

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

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

\frac{1}{cos ( x )} \cdot \frac{sin ( x )}{cos ( x )}

分数を乗じる:

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

= \frac{1 \cdot sin ( x )}{cos ( x ) cos ( x )}

乗算:

1 \cdot sin (x) = sin (x)

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

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

cos (x) cos (x)

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

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

= cos^{1 + 1} (x)

数を足す:

1 + 1 = 2

= cos^{2} (x)

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

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

元を分数に変換する:

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

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

以下の最小公倍数:

1, sin (x), cos^{2} (x) : cos^{2} (x) sin (x)

1, sin (x), cos^{2} (x)

最小公倍数 (LCM)

因数分解された式の 1 つ以上に合わられる因数で構成された式を計算する

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

LCMに基づいて分数を調整する

該当する分母を乗じてLCMに変えるために

必要な量で各分子を乗じる

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

\frac{sin ( x )}{1}

の場合

:

分母と分子に以下を乗じる:

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

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

\frac{cos ^{2} ( x )}{sin ( x )}

の場合

:

分母と分子に以下を乗じる:

cos^{2} (x)

\frac{cos ^{2} ( x )}{sin ( x )} = \frac{cos ^{2} ( x ) cos ^{2} ( x )}{sin ( x ) cos ^{2} ( x )} = \frac{cos ^{4} ( x )}{cos ^{2} ( x ) sin ( x )}

\frac{sin ( x )}{cos ^{2} ( x )}

の場合

:

分母と分子に以下を乗じる:

sin (x)

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

= - \frac{cos ^{2} ( x ) sin ^{2} ( x )}{cos ^{2} ( x ) sin ( x )} - \frac{cos ^{4} ( x )}{cos ^{2} ( x ) sin ( x )} + \frac{sin ^{2} ( x )}{cos ^{2} ( x ) sin ( x )}

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{- cos ^{2} ( x ) sin ^{2} ( x ) - cos ^{4} ( x ) + sin ^{2} ( x )}{cos ^{2} ( x ) sin ( x )}

= \frac{- cos ^{2} ( x ) sin ^{2} ( x ) - cos ^{4} ( x ) + sin ^{2} ( x )}{cos ^{2} ( x ) sin ( x )}

\frac{- cos ^{4} ( x ) + sin ^{2} ( x ) - cos ^{2} ( x ) sin ^{2} ( x )}{cos ^{2} ( x ) sin ( x )} = 0

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

- cos^{4} (x) + sin^{2} (x) - cos^{2} (x) sin^{2} (x) = 0

三角関数の公式を使用して書き換える

- cos^{4} (x) + sin^{2} (x) - cos^{2} (x) sin^{2} (x)

ピタゴラスの公式を使用する:

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

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

= - cos^{4} (x) + sin^{2} (x) - (1 - sin^{2} (x)) sin^{2} (x)

簡素化

- cos^{4} (x) + sin^{2} (x) - (1 - sin^{2} (x)) sin^{2} (x) : - cos^{4} (x) + sin^{4} (x)

- cos^{4} (x) + sin^{2} (x) - (1 - sin^{2} (x)) sin^{2} (x)

= - cos^{4} (x) + sin^{2} (x) - sin^{2} (x) (1 - sin^{2} (x))

拡張

- sin^{2} (x) (1 - sin^{2} (x)) : - sin^{2} (x) + sin^{4} (x)

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

分配法則を適用する:

a (b - c) = ab - a c

a = - sin^{2} (x), b = 1, c = sin^{2} (x)

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

マイナス・プラスの規則を適用する

- (- a) = a

= - 1 \cdot sin^{2} (x) + sin^{2} (x) sin^{2} (x)

簡素化

- 1 \cdot sin^{2} (x) + sin^{2} (x) sin^{2} (x) : - sin^{2} (x) + sin^{4} (x)

- 1 \cdot sin^{2} (x) + sin^{2} (x) sin^{2} (x)

1 \cdot sin^{2} (x) = sin^{2} (x)

1 \cdot sin^{2} (x)

乗算:

1 \cdot sin^{2} (x) = sin^{2} (x)

= sin^{2} (x)

sin^{2} (x) sin^{2} (x) = sin^{4} (x)

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

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

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

= sin^{2 + 2} (x)

数を足す:

2 + 2 = 4

= sin^{4} (x)

= - sin^{2} (x) + sin^{4} (x)

= - sin^{2} (x) + sin^{4} (x)

= - cos^{4} (x) + sin^{2} (x) - sin^{2} (x) + sin^{4} (x)

類似した元を足す:

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

= - cos^{4} (x) + sin^{4} (x)

= - cos^{4} (x) + sin^{4} (x)

- cos^{4} (x) + sin^{4} (x) = 0

因数

- cos^{4} (x) + sin^{4} (x) : (sin^{2} (x) + cos^{2} (x)) (sin (x) + cos (x)) (sin (x) - cos (x))

- cos^{4} (x) + sin^{4} (x)

sin^{4} (x) - cos^{4} (x)

を書き換え

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

sin^{4} (x) - cos^{4} (x)

指数の規則を適用する:

a^{b c} = (a^{b})^{c}

sin^{4} (x) = (sin^{2} (x))^{2}

= (sin^{2} (x))^{2} - cos^{4} (x)

指数の規則を適用する:

a^{b c} = (a^{b})^{c}

cos^{4} (x) = (cos^{2} (x))^{2}

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

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

2乗の差の公式を適用する:

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

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

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

因数

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

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

2乗の差の公式を適用する:

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

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

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

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

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

三角関数の公式を使用して書き換える

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

ピタゴラスの公式を使用する:

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

= (- cos (x) + sin (x)) (cos (x) + sin (x)) \cdot 1

簡素化

(- cos (x) + sin (x)) (cos (x) + sin (x)) \cdot 1 : (- cos (x) + sin (x)) (cos (x) + sin (x))

(- cos (x) + sin (x)) (cos (x) + sin (x)) \cdot 1

乗算:

(cos (x) + sin (x)) \cdot 1 = (cos (x) + sin (x))

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

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

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

各部分を別個に解く

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

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

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

三角関数の公式を使用して書き換える

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

cos (x), cos (x) \neq = 0

で両辺を割る

\frac{- cos ( x ) + sin ( x )}{cos ( x )} = \frac{0}{cos ( x )}

簡素化

- 1 + \frac{sin ( x )}{cos ( x )} = 0

基本的な三角関数の公式を使用する:

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

- 1 + tan (x) = 0

- 1 + tan (x) = 0

1

を右側に移動します

- 1 + tan (x) = 0

両辺に

1

を足す

- 1 + tan (x) + 1 = 0 + 1

簡素化

tan (x) = 1

tan (x) = 1

以下の一般解

tan (x) = 1

tan (x)

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

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

cos (x) + sin (x) = 0

三角関数の公式を使用して書き換える

cos (x) + sin (x) = 0

cos (x), cos (x) \neq = 0

で両辺を割る

\frac{cos ( x ) + sin ( x )}{cos ( x )} = \frac{0}{cos ( x )}

簡素化

1 + \frac{sin ( x )}{cos ( x )} = 0

基本的な三角関数の公式を使用する:

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

1 + tan (x) = 0

1 + tan (x) = 0

1

を右側に移動します

1 + tan (x) = 0

両辺から

1

を引く

1 + tan (x) - 1 = 0 - 1

簡素化

tan (x) = - 1

tan (x) = - 1

以下の一般解

tan (x) = - 1

tan (x)

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

x = \frac{3 π}{4} + πn

x = \frac{3 π}{4} + πn

すべての解を組み合わせる

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

グラフ

人気の例

4sin(x)=-cos^2(x)+1

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

sin(2x)=-5cos(2x)

sin (2 x) = - 5 cos (2 x)

tan(x)cot(x)=sec(x)csc(x)

tan (x) cot (x) = sec (x) csc (x)

4sin(x)=cos(x)-2

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

sin(θ)=1-cos(θ)

sin (θ) = 1 - cos (θ)