libm.info: cbrt

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`cbrt', `cbrtf'--cube root

*Synopsis*
     #include <math.h>
     double cbrt(double X);
     float  cbrtf(float X);
   *Description*
`cbrt' computes the cube root of the argument.
*Returns*
The cube root is returned.
*Portability*
`cbrt' is in System V release 4.  `cbrtf' is an extension.