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人気のある三角関数 >

7cos(x)+7sin(x)tan(x)=14

解

7 cos (x) + 7 sin (x) tan (x) = 14

解

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

+1

度

x = 6 0^{\circ} + 36 0^{\circ} n, x = 30 0^{\circ} + 36 0^{\circ} n

解答ステップ

7 cos (x) + 7 sin (x) tan (x) = 14

両辺から

14

を引く

7 cos (x) + 7 sin (x) tan (x) - 14 = 0

三角関数の公式を使用して書き換える

- 14 + 7 cos (x) + 7 sin (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 )}

= - 14 + 7 cos (x) + 7 sin (x) \frac{sin ( x )}{cos ( x )}

7 sin (x) \frac{sin ( x )}{cos ( x )} = \frac{7 sin ^{2} ( x )}{cos ( x )}

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

分数を乗じる:

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

= \frac{sin ( x ) \cdot 7 sin ( x )}{cos ( x )}

sin (x) \cdot 7 sin (x) = 7 sin^{2} (x)

sin (x) \cdot 7 sin (x)

指数の規則を適用する:

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

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

= 7 sin^{1 + 1} (x)

数を足す:

1 + 1 = 2

= 7 sin^{2} (x)

= \frac{7 sin ^{2} ( x )}{cos ( x )}

= - 14 + 7 cos (x) + \frac{7 sin ^{2} ( x )}{cos ( x )}

ピタゴラスの公式を使用する:

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

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

= - 14 + \frac{7 ( 1 - cos ^{2} ( x ) )}{cos ( x )} + 7 cos (x)

分数を組み合わせる

\frac{7 ( - cos ^{2} ( x ) + 1 )}{cos ( x )} + 7 cos (x) : \frac{7}{cos ( x )}

\frac{7 ( - cos ^{2} ( x ) + 1 )}{cos ( x )} + 7 cos (x)

元を分数に変換する:

7 cos (x) = \frac{7 cos ( x ) cos ( x )}{cos ( x )}

= \frac{7 ( 1 - cos ^{2} ( x ) )}{cos ( x )} + \frac{7 cos ( x ) cos ( x )}{cos ( 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{7 ( 1 - cos ^{2} ( x ) ) + 7 cos ( x ) cos ( x )}{cos ( x )}

7 (1 - cos^{2} (x)) + 7 cos (x) cos (x) = 7 (1 - cos^{2} (x)) + 7 cos^{2} (x)

7 (1 - cos^{2} (x)) + 7 cos (x) cos (x)

7 cos (x) cos (x) = 7 cos^{2} (x)

7 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)

= 7 cos^{1 + 1} (x)

数を足す:

1 + 1 = 2

= 7 cos^{2} (x)

= 7 (- cos^{2} (x) + 1) + 7 cos^{2} (x)

= \frac{7 ( - cos ^{2} ( x ) + 1 ) + 7 cos ^{2} ( x )}{cos ( x )}

拡張

7 (1 - cos^{2} (x)) + 7 cos^{2} (x) : 7

7 (1 - cos^{2} (x)) + 7 cos^{2} (x)

拡張

7 (1 - cos^{2} (x)) : 7 - 7 cos^{2} (x)

7 (1 - cos^{2} (x))

分配法則を適用する:

a (b - c) = ab - a c

a = 7, b = 1, c = cos^{2} (x)

= 7 \cdot 1 - 7 cos^{2} (x)

数を乗じる:

7 \cdot 1 = 7

= 7 - 7 cos^{2} (x)

= 7 - 7 cos^{2} (x) + 7 cos^{2} (x)

類似した元を足す:

- 7 cos^{2} (x) + 7 cos^{2} (x) = 0

= 7

= \frac{7}{cos ( x )}

= \frac{7}{cos ( x )} - 14

- 14 + \frac{7}{cos ( x )} = 0

- 14 + \frac{7}{cos ( x )} = 0

以下で両辺を乗じる:

cos (x)

- 14 + \frac{7}{cos ( x )} = 0

以下で両辺を乗じる:

cos (x)

- 14 cos (x) + \frac{7}{cos ( x )} cos (x) = 0 \cdot cos (x)

簡素化

- 14 cos (x) + \frac{7}{cos ( x )} cos (x) = 0 \cdot cos (x)

簡素化

\frac{7}{cos ( x )} cos (x) : 7

\frac{7}{cos ( x )} cos (x)

分数を乗じる:

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

= \frac{7 cos ( x )}{cos ( x )}

共通因数を約分する:

cos (x)

= 7

簡素化

0 \cdot cos (x) : 0

0 \cdot cos (x)

規則を適用

0 \cdot a = 0

= 0

- 14 cos (x) + 7 = 0

- 14 cos (x) + 7 = 0

- 14 cos (x) + 7 = 0

7

を右側に移動します

- 14 cos (x) + 7 = 0

両辺から

7

を引く

- 14 cos (x) + 7 - 7 = 0 - 7

簡素化

- 14 cos (x) = - 7

- 14 cos (x) = - 7

以下で両辺を割る

- 14

- 14 cos (x) = - 7

以下で両辺を割る

- 14

\frac{- 14 cos ( x )}{- 14} = \frac{- 7}{- 14}

簡素化

\frac{- 14 cos ( x )}{- 14} = \frac{- 7}{- 14}

簡素化

\frac{- 14 cos ( x )}{- 14} : cos (x)

\frac{- 14 cos ( x )}{- 14}

分数の規則を適用する:

\frac{- a}{- b} = \frac{a}{b}

= \frac{14 cos ( x )}{14}

数を割る:

\frac{14}{14} = 1

= cos (x)

簡素化

\frac{- 7}{- 14} : \frac{1}{2}

\frac{- 7}{- 14}

分数の規則を適用する:

\frac{- a}{- b} = \frac{a}{b}

= \frac{7}{14}

共通因数を約分する:

7

= \frac{1}{2}

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

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

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

解を検算する

未定義の (特異) 点を求める:

cos (x) = 0

- 14 + \frac{7}{cos ( x )}

の分母をゼロに比較する

cos (x) = 0

以下の点は定義されていない

cos (x) = 0

未定義のポイントを解に組み合わせる:

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

以下の一般解

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

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

グラフ

人気の例

cot(θ)+5csc(θ)=6

cot (θ) + 5 csc (θ) = 6

sqrt(3)csc^2(x)+2csc(x)=0

3 csc^{2} (x) + 2 csc (x) = 0

7sin(2x)sin(x)=7cos(x)

7 sin (2 x) sin (x) = 7 cos (x)

csc(x)+cot(x)=3

csc (x) + cot (x) = 3

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

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