Description
The
acos function computes the principal value of
the arc cosine of x. A domain
error occurs for arguments not in the range [-1, +1].
Returns
The
acos function returns the arc cosine in the
range [0, pi] radians.
Implementation Notes
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For arguments < -1.0, asin returns -pi/2 and sets
EDOM.
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For arguments > +1.0, asin returns +pi/2 and sets
EDOM.
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