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  Include:   <math.h>
 
  Syntax:    double pow( double x, double y );
             long double powl( long double x, long double y );
 
  Returns:   <x> raised to the power of <y> if successful, or 0.0
             or ±HUGE_VAL or ±_LHUGE_VAL if not.
 
  See also:  exp, log, sqrt
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