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(A)= 5/9

解答

cos (A) = \frac{5}{9}

解答

A = 0.98176 \dots + 2 πn, A = 2 π - 0.98176 \dots + 2 πn

+1

度数

A = 56.25101 \dots^{\circ} + 36 0^{\circ} n, A = 303.74898 \dots^{\circ} + 36 0^{\circ} n

求解步骤

cos (A) = \frac{5}{9}

使用反三角函数性质

cos (A) = \frac{5}{9}

cos (A) = \frac{5}{9}

的通解

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

A = arccos (\frac{5}{9}) + 2 πn, A = 2 π - arccos (\frac{5}{9}) + 2 πn

A = arccos (\frac{5}{9}) + 2 πn, A = 2 π - arccos (\frac{5}{9}) + 2 πn

以小数形式表示解

A = 0.98176 \dots + 2 πn, A = 2 π - 0.98176 \dots + 2 πn

作图

流行的例子

cos (x) = 0.56

3 - cot^{2} (x) = 0

(-4cos(x)+2sin(x))^2+12sin^2(x)=24

(- 4 cos (x) + 2 sin (x))^{2} + 12 sin^{2} (x) = 24

-arccos(x)+arctan(5/12)=0

- arccos (x) + arctan (\frac{5}{12}) = 0

sqrt(3)cos(x)+sin(x)=1

3 cos (x) + sin (x) = 1