EXP(3M)                                                   EXP(3M)

          exp, log, log10, pow, sqrt - exponential, logarithm, power,
          square root

          #include <math.h>

          double exp(x)
          double x;

          double log(x)
          double x;

          double log10(x)
          double x;

          double pow(x, y)
          double x, y;

          double sqrt(x)
          double x;

          Exp returns the exponential function of x.

          Log returns the natural logarithm of x; log10 returns the
          base 10 logarithm.

          Pow returns xy.

          Sqrt returns the square root of x.

          hypot(3), sinh(3), intro(2)

          Exp and pow return a huge value when the correct value would
          overflow; errno is set to ERANGE.  Pow returns 0 and sets
          errno to EDOM when the second argument is negative and non-
          integral and when both arguments are 0.

          Log returns a huge negative value when x is zero or nega-
          tive; errno is set to EDOM.

          Sqrt returns 0 when x is negative; errno is set to EDOM.