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CRTL, asin, Description
 *Conan The Librarian 

    The asin functions compute the principal value of the arc sine of
    x in the range [-pi/2,pi/2] radians for x in the domain [-1,1].

    The asind functions compute the principal value of the arc sine
    of x in the range [-90,90] degrees for x in the domain [-1,1].

    When abs(x) is greater than 1.0, the value of asin(x) is 0, and
    errno is set to EDOM.
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