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CRTL, acos, Description
 *Conan The Librarian 

    The acos functions compute the principal value of the arc cosine
    of x in the range [0,pi] radians for x in the domain [-1,1].

    The acosd functions compute the principal value of the arc cosine
    of x in the range [0,180] degrees for x in the domain [-1,1].

    For abs(x) > 1, the value of acos(x) is 0, and errno is set to
    EDOM.
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