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受欢迎的三角函数 >

arccos(x)=(79)/(9sqrt(70))

解答

arccos (x) = \frac{79}{9 70}

解答

x = cos (\frac{79 70}{630})

求解步骤

arccos (x) = \frac{79}{9 70}

化简

\frac{79}{9 70} : \frac{79 70}{630}

\frac{79}{9 70}

乘以共轭根式

\frac{70}{70}

= \frac{79 70}{9 70 70}

97070 = 630

97070

使用根式运算法则:

a a = a

7070 = 70

= 9 \cdot 70

数字相乘:

9 \cdot 70 = 630

= 630

= \frac{79 70}{630}

arccos (x) = \frac{79 70}{630}

使用反三角函数性质

arccos (x) = \frac{79 70}{630}

arccos (x) = a \Rightarrow x = cos (a)

x = cos (\frac{79 70}{630})

x = cos (\frac{79 70}{630})

作图

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