zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的三角函数 >

-cos(x)=0.9

解答

- cos (x) = 0.9

解答

x = 2.69056 \dots + 2 πn, x = - 2.69056 \dots + 2 πn

+1

度数

x = 154.15806 \dots^{\circ} + 36 0^{\circ} n, x = - 154.15806 \dots^{\circ} + 36 0^{\circ} n

求解步骤

- cos (x) = 0.9

两边除以

- 1

- cos (x) = 0.9

两边除以

- 1

\frac{- cos ( x )}{- 1} = \frac{0.9}{- 1}

化简

cos (x) = - 0.9

cos (x) = - 0.9

使用反三角函数性质

cos (x) = - 0.9

cos (x) = - 0.9

的通解

cos (x) = - a \Rightarrow x = arccos (- a) + 2 πn, x = - arccos (- a) + 2 πn

x = arccos (- 0.9) + 2 πn, x = - arccos (- 0.9) + 2 πn

x = arccos (- 0.9) + 2 πn, x = - arccos (- 0.9) + 2 πn

以小数形式表示解

x = 2.69056 \dots + 2 πn, x = - 2.69056 \dots + 2 πn

作图

流行的例子

sqrt(3)cos(θ)-2sin(θ)cos(θ)=0

3 cos (θ) - 2 sin (θ) cos (θ) = 0

sec(x)+sin^2(x)+cos^2(x)=tan^2(x)

sec (x) + sin^{2} (x) + cos^{2} (x) = tan^{2} (x)

4sin^2(x)-3=4,sin(2x)-3=0

4 sin^{2} (x) - 3 = 4, sin (2 x) - 3 = 0

sin(2x)=5sin(x)

sin (2 x) = 5 sin (x)

tan(x)=-sqrt(3)+2

tan (x) = - 3 + 2