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人気のある三角関数 >

tan(4x+20)*cot(x+50)=1

解

tan (4 x + 20) \cdot cot (x + 5 0^{\circ}) = 1

解

x = \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}, x = 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

+1

ラジアン

x = - \frac{20}{3} + \frac{5 π}{54} + \frac{2 π}{3} n, x = \frac{23 π}{54} - \frac{20}{3} + \frac{2 π}{3} n

解答ステップ

tan (4 x + 20) cot (x + 5 0^{\circ}) = 1

両辺から

1

を引く

tan (4 x + 20) cot (x + 5 0^{\circ}) - 1 = 0

サイン, コサインで表わす

- 1 + cot (5 0^{\circ} + x) tan (20 + 4 x)

基本的な三角関数の公式を使用する:

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

= - 1 + \frac{cos ( 5 0 ^{\circ} + x )}{sin ( 5 0 ^{\circ} + x )} tan (20 + 4 x)

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{cos ( 5 0 ^{\circ} + x )}{sin ( 5 0 ^{\circ} + x )} \cdot \frac{sin ( 20 + 4 x )}{cos ( 20 + 4 x )}

簡素化

- 1 + \frac{cos ( 5 0 ^{\circ} + x )}{sin ( 5 0 ^{\circ} + x )} \cdot \frac{sin ( 20 + 4 x )}{cos ( 20 + 4 x )} : \frac{- sin ( \frac{90 0 ^{\circ} + 18 x}{18} ) cos ( 20 + 4 x ) + cos ( \frac{90 0 ^{\circ} + 18 x}{18} ) sin ( 20 + 4 x )}{sin ( \frac{90 0 ^{\circ} + 18 x}{18} ) cos ( 20 + 4 x )}

- 1 + \frac{cos ( 5 0 ^{\circ} + x )}{sin ( 5 0 ^{\circ} + x )} \cdot \frac{sin ( 20 + 4 x )}{cos ( 20 + 4 x )}

\frac{cos ( 5 0 ^{\circ} + x )}{sin ( 5 0 ^{\circ} + x )} \cdot \frac{sin ( 20 + 4 x )}{cos ( 20 + 4 x )} = \frac{cos ( \frac{90 0 ^{\circ} + 18 x}{18} ) sin ( 20 + 4 x )}{sin ( \frac{90 0 ^{\circ} + 18 x}{18} ) cos ( 20 + 4 x )}

\frac{cos ( 5 0 ^{\circ} + x )}{sin ( 5 0 ^{\circ} + x )} \cdot \frac{sin ( 20 + 4 x )}{cos ( 20 + 4 x )}

分数を乗じる:

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

= \frac{cos ( 5 0 ^{\circ} + x ) sin ( 20 + 4 x )}{sin ( 5 0 ^{\circ} + x ) cos ( 20 + 4 x )}

結合

5 0^{\circ} + x : \frac{90 0 ^{\circ} + 18 x}{18}

5 0^{\circ} + x

元を分数に変換する:

x = \frac{x 18}{18}

= 5 0^{\circ} + \frac{x \cdot 18}{18}

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{90 0 ^{\circ} + x \cdot 18}{18}

= \frac{cos ( x + 5 0 ^{\circ} ) sin ( 4 x + 20 )}{sin ( \frac{18 x + 90 0 ^{\circ}}{18} ) cos ( 4 x + 20 )}

結合

5 0^{\circ} + x : \frac{90 0 ^{\circ} + 18 x}{18}

5 0^{\circ} + x

元を分数に変換する:

x = \frac{x 18}{18}

= 5 0^{\circ} + \frac{x \cdot 18}{18}

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{90 0 ^{\circ} + x \cdot 18}{18}

= \frac{cos ( \frac{18 x + 90 0 ^{\circ}}{18} ) sin ( 4 x + 20 )}{sin ( \frac{18 x + 90 0 ^{\circ}}{18} ) cos ( 4 x + 20 )}

= - 1 + \frac{cos ( \frac{18 x + 90 0 ^{\circ}}{18} ) sin ( 4 x + 20 )}{sin ( \frac{18 x + 90 0 ^{\circ}}{18} ) cos ( 4 x + 20 )}

元を分数に変換する:

1 = \frac{1 sin ( \frac{90 0 ^{\circ} + x 18}{18} ) cos ( 20 + 4 x )}{sin ( \frac{90 0 ^{\circ} + x 18}{18} ) cos ( 20 + 4 x )}

= - \frac{1 \cdot sin ( \frac{90 0 ^{\circ} + x \cdot 18}{18} ) cos ( 20 + 4 x )}{sin ( \frac{90 0 ^{\circ} + x \cdot 18}{18} ) cos ( 20 + 4 x )} + \frac{cos ( \frac{90 0 ^{\circ} + x \cdot 18}{18} ) sin ( 20 + 4 x )}{sin ( \frac{90 0 ^{\circ} + x \cdot 18}{18} ) cos ( 20 + 4 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{- 1 \cdot sin ( \frac{90 0 ^{\circ} + x \cdot 18}{18} ) cos ( 20 + 4 x ) + cos ( \frac{90 0 ^{\circ} + x \cdot 18}{18} ) sin ( 20 + 4 x )}{sin ( \frac{90 0 ^{\circ} + x \cdot 18}{18} ) cos ( 20 + 4 x )}

乗算:

1 \cdot sin (\frac{90 0 ^{\circ} + x \cdot 18}{18}) = sin (\frac{90 0 ^{\circ} + x \cdot 18}{18})

= \frac{- sin ( \frac{18 x + 90 0 ^{\circ}}{18} ) cos ( 4 x + 20 ) + cos ( \frac{18 x + 90 0 ^{\circ}}{18} ) sin ( 4 x + 20 )}{sin ( \frac{18 x + 90 0 ^{\circ}}{18} ) cos ( 4 x + 20 )}

= \frac{- sin ( \frac{90 0 ^{\circ} + 18 x}{18} ) cos ( 20 + 4 x ) + cos ( \frac{90 0 ^{\circ} + 18 x}{18} ) sin ( 20 + 4 x )}{sin ( \frac{90 0 ^{\circ} + 18 x}{18} ) cos ( 20 + 4 x )}

\frac{- cos ( 20 + 4 x ) sin ( \frac{18 x + 90 0 ^{\circ}}{18} ) + cos ( \frac{18 x + 90 0 ^{\circ}}{18} ) sin ( 20 + 4 x )}{cos ( 20 + 4 x ) sin ( \frac{18 x + 90 0 ^{\circ}}{18} )} = 0

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

- cos (20 + 4 x) sin (\frac{18 x + 90 0 ^{\circ}}{18}) + cos (\frac{18 x + 90 0 ^{\circ}}{18}) sin (20 + 4 x) = 0

三角関数の公式を使用して書き換える

- cos (20 + 4 x) sin (\frac{18 x + 90 0 ^{\circ}}{18}) + cos (\frac{18 x + 90 0 ^{\circ}}{18}) sin (20 + 4 x)

角の差の公式を使用する:

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

= sin (20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18})

sin (20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18}) = 0

以下の一般解

sin (20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18}) = 0

sin (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} 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}

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 0 + 36 0^{\circ} n, 20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 0 + 36 0^{\circ} n, 20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n

解く

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 0 + 36 0^{\circ} n : x = \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 0 + 36 0^{\circ} n

0 + 36 0^{\circ} n = 36 0^{\circ} n

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 36 0^{\circ} n

20

を右側に移動します

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 36 0^{\circ} n

両辺から

20

を引く

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} - 20 = 36 0^{\circ} n - 20

簡素化

4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 36 0^{\circ} n - 20

4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 36 0^{\circ} n - 20

以下で両辺を乗じる:

18

4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 36 0^{\circ} n - 20

以下で両辺を乗じる:

18

4 x \cdot 18 - \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18 = 36 0^{\circ} n \cdot 18 - 20 \cdot 18

簡素化

4 x \cdot 18 - \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18 = 36 0^{\circ} n \cdot 18 - 20 \cdot 18

簡素化

4 x \cdot 18 : 72 x

4 x \cdot 18

数を乗じる:

4 \cdot 18 = 72

= 72 x

簡素化

- \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18 : - (18 x + 90 0^{\circ})

- \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18

分数を乗じる:

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

= - \frac{( 18 x + 90 0 ^{\circ} ) \cdot 18}{18}

共通因数を約分する:

18

= - (18 x + 90 0^{\circ})

簡素化

36 0^{\circ} n \cdot 18 : 648 0^{\circ} n

36 0^{\circ} n \cdot 18

数を乗じる:

2 \cdot 18 = 36

= 648 0^{\circ} n

簡素化

- 20 \cdot 18 : - 360

- 20 \cdot 18

数を乗じる:

20 \cdot 18 = 360

= - 360

72 x - (18 x + 90 0^{\circ}) = 648 0^{\circ} n - 360

72 x - (18 x + 90 0^{\circ}) = 648 0^{\circ} n - 360

72 x - (18 x + 90 0^{\circ}) = 648 0^{\circ} n - 360

拡張

72 x - (18 x + 90 0^{\circ}) : 54 x - 90 0^{\circ}

72 x - (18 x + 90 0^{\circ})

- (18 x + 90 0^{\circ}) : - 18 x - 90 0^{\circ}

- (18 x + 90 0^{\circ})

括弧を分配する

= - (18 x) - (90 0^{\circ})

マイナス・プラスの規則を適用する

+ (- a) = - a

= - 18 x - 90 0^{\circ}

= 72 x - 18 x - 90 0^{\circ}

類似した元を足す:

72 x - 18 x = 54 x

= 54 x - 90 0^{\circ}

54 x - 90 0^{\circ} = 648 0^{\circ} n - 360

90 0^{\circ}

を右側に移動します

54 x - 90 0^{\circ} = 648 0^{\circ} n - 360

両辺に

90 0^{\circ}

を足す

54 x - 90 0^{\circ} + 90 0^{\circ} = 648 0^{\circ} n - 360 + 90 0^{\circ}

簡素化

54 x = 648 0^{\circ} n - 360 + 90 0^{\circ}

54 x = 648 0^{\circ} n - 360 + 90 0^{\circ}

以下で両辺を割る

54

54 x = 648 0^{\circ} n - 360 + 90 0^{\circ}

以下で両辺を割る

54

\frac{54 x}{54} = \frac{648 0 ^{\circ} n}{54} - \frac{360}{54} + 16.66666 \dots^{\circ}

簡素化

\frac{54 x}{54} = \frac{648 0 ^{\circ} n}{54} - \frac{360}{54} + 16.66666 \dots^{\circ}

簡素化

\frac{54 x}{54} : x

\frac{54 x}{54}

数を割る:

\frac{54}{54} = 1

= x

簡素化

\frac{648 0 ^{\circ} n}{54} - \frac{360}{54} + 16.66666 \dots^{\circ} : \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}

\frac{648 0 ^{\circ} n}{54} - \frac{360}{54} + 16.66666 \dots^{\circ}

キャンセル

\frac{648 0 ^{\circ} n}{54} : \frac{36 0 ^{\circ} n}{3}

\frac{648 0 ^{\circ} n}{54}

共通因数を約分する:

18

= \frac{36 0 ^{\circ} n}{3}

= \frac{36 0 ^{\circ} n}{3} - \frac{360}{54} + 16.66666 \dots^{\circ}

キャンセル

\frac{360}{54} : \frac{20}{3}

\frac{360}{54}

共通因数を約分する:

18

= \frac{20}{3}

= \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}

x = \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}

x = \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}

x = \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}

解く

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n : x = 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n

20

を右側に移動します

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n

両辺から

20

を引く

20 + 4 x - \frac{18 x + 90 0 ^{\circ}}{18} - 20 = 18 0^{\circ} + 36 0^{\circ} n - 20

簡素化

4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n - 20

4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n - 20

以下で両辺を乗じる:

18

4 x - \frac{18 x + 90 0 ^{\circ}}{18} = 18 0^{\circ} + 36 0^{\circ} n - 20

以下で両辺を乗じる:

18

4 x \cdot 18 - \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18 = 18 0^{\circ} 18 + 36 0^{\circ} n \cdot 18 - 20 \cdot 18

簡素化

4 x \cdot 18 - \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18 = 18 0^{\circ} 18 + 36 0^{\circ} n \cdot 18 - 20 \cdot 18

簡素化

4 x \cdot 18 : 72 x

4 x \cdot 18

数を乗じる:

4 \cdot 18 = 72

= 72 x

簡素化

- \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18 : - (18 x + 90 0^{\circ})

- \frac{18 x + 90 0 ^{\circ}}{18} \cdot 18

分数を乗じる:

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

= - \frac{( 18 x + 90 0 ^{\circ} ) \cdot 18}{18}

共通因数を約分する:

18

= - (18 x + 90 0^{\circ})

簡素化

18 0^{\circ} 18 : 324 0^{\circ}

18 0^{\circ} 18

交換法則を適用する:

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

324 0^{\circ}

簡素化

36 0^{\circ} n \cdot 18 : 648 0^{\circ} n

36 0^{\circ} n \cdot 18

数を乗じる:

2 \cdot 18 = 36

= 648 0^{\circ} n

簡素化

- 20 \cdot 18 : - 360

- 20 \cdot 18

数を乗じる:

20 \cdot 18 = 360

= - 360

72 x - (18 x + 90 0^{\circ}) = 324 0^{\circ} + 648 0^{\circ} n - 360

72 x - (18 x + 90 0^{\circ}) = 324 0^{\circ} + 648 0^{\circ} n - 360

72 x - (18 x + 90 0^{\circ}) = 324 0^{\circ} + 648 0^{\circ} n - 360

拡張

72 x - (18 x + 90 0^{\circ}) : 54 x - 90 0^{\circ}

72 x - (18 x + 90 0^{\circ})

- (18 x + 90 0^{\circ}) : - 18 x - 90 0^{\circ}

- (18 x + 90 0^{\circ})

括弧を分配する

= - (18 x) - (90 0^{\circ})

マイナス・プラスの規則を適用する

+ (- a) = - a

= - 18 x - 90 0^{\circ}

= 72 x - 18 x - 90 0^{\circ}

類似した元を足す:

72 x - 18 x = 54 x

= 54 x - 90 0^{\circ}

54 x - 90 0^{\circ} = 324 0^{\circ} + 648 0^{\circ} n - 360

90 0^{\circ}

を右側に移動します

54 x - 90 0^{\circ} = 324 0^{\circ} + 648 0^{\circ} n - 360

両辺に

90 0^{\circ}

を足す

54 x - 90 0^{\circ} + 90 0^{\circ} = 324 0^{\circ} + 648 0^{\circ} n - 360 + 90 0^{\circ}

簡素化

54 x = 414 0^{\circ} + 648 0^{\circ} n - 360

54 x = 414 0^{\circ} + 648 0^{\circ} n - 360

以下で両辺を割る

54

54 x = 414 0^{\circ} + 648 0^{\circ} n - 360

以下で両辺を割る

54

\frac{54 x}{54} = 76.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} - \frac{360}{54}

簡素化

\frac{54 x}{54} = 76.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} - \frac{360}{54}

簡素化

\frac{54 x}{54} : x

\frac{54 x}{54}

数を割る:

\frac{54}{54} = 1

= x

簡素化

76.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} - \frac{360}{54} : 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

76.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} - \frac{360}{54}

条件のようなグループ

= 76.66666 \dots^{\circ} - \frac{360}{54} + \frac{648 0 ^{\circ} n}{54}

キャンセル

\frac{360}{54} : \frac{20}{3}

\frac{360}{54}

共通因数を約分する:

18

= \frac{20}{3}

= 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{648 0 ^{\circ} n}{54}

キャンセル

\frac{648 0 ^{\circ} n}{54} : \frac{36 0 ^{\circ} n}{3}

\frac{648 0 ^{\circ} n}{54}

共通因数を約分する:

18

= \frac{36 0 ^{\circ} n}{3}

= 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

x = 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

x = 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

x = 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

x = \frac{36 0 ^{\circ} n}{3} - \frac{20}{3} + 16.66666 \dots^{\circ}, x = 76.66666 \dots^{\circ} - \frac{20}{3} + \frac{36 0 ^{\circ} n}{3}

グラフ

人気の例

csc (x) = - 0.5

cos (θ) - 4 = - 3

csc^2(x)+2csc(x)-3=-4

csc^{2} (x) + 2 csc (x) - 3 = - 4

- cos (θ) = 0

cos (w) = 0.53