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受欢迎的三角函数 >

cos(x)=-5/6

解答

cos (x) = - \frac{5}{6}

解答

x = 2.55590 \dots + 2 πn, x = - 2.55590 \dots + 2 πn

+1

度数

x = 146.44269 \dots^{\circ} + 36 0^{\circ} n, x = - 146.44269 \dots^{\circ} + 36 0^{\circ} n

求解步骤

cos (x) = - \frac{5}{6}

使用反三角函数性质

cos (x) = - \frac{5}{6}

cos (x) = - \frac{5}{6}

的通解

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

x = arccos (- \frac{5}{6}) + 2 πn, x = - arccos (- \frac{5}{6}) + 2 πn

x = arccos (- \frac{5}{6}) + 2 πn, x = - arccos (- \frac{5}{6}) + 2 πn

以小数形式表示解

x = 2.55590 \dots + 2 πn, x = - 2.55590 \dots + 2 πn

作图

流行的例子

2sin(x/2)-sqrt(3)=0

2 sin (\frac{x}{2}) - 3 = 0

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tan (a) = 3

tan(x)+1=sqrt(3)+sqrt(3)cot(x)

tan (x) + 1 = 3 + 3 cot (x)