Library /sys$common/syshlp/helplib.hlb  —  CRTL  pow  Description
    The pow functions raise a floating-point base x to a floating-
    point exponent y. The value of pow(x,y) is computed as e**(y
    ln(x)) for positive x.

    If x is 0 and y is negative, HUGE_VAL is returned and errno is
    set to ERANGE or EDOM.
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