exp, log, log10, pow - exponential, logarithmic and power functions

**#include
** *x***);
double log(double** *x***);
double log10(double** *x***);
double pow(double** *x***, double** *y***);
**

The **exp()** function returns the value of e (the base
of natural logarithms) raised to the power of
*x*.

The **log()** function returns the natural logarithm of
*x*.

The **log10()** function returns the base-10 logarithm of
*x*.

The **pow()** function returns the value of *x*
raised to the power of *y*.

The **log()** and **log10()** functions can return the
following errors:

The **pow()** function can return the following
error:

- EDOM
- The argument
*x*is negative and*y*is not an integral value. This would result in a complex number.

SVID 3, POSIX, BSD 4.3, ISO 9899

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