Since arccosine is the inverse function of cosine, the cosine of arccosine of *x* is equal to *x*:

cos( arccos *x* ) = *x*

*x* has values from -1 to 1:

*x*∈[-1,1]

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Since arccosine is the inverse function of cosine, the cosine of arccosine of *x* is equal to *x*:

cos( arccos *x* ) = *x*

*x* has values from -1 to 1:

*x*∈[-1,1]

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