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]