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1.1       root        1: .TH EXP 3M
                      2: .CT 2 math
                      3: .SH NAME
                      4: exp, log, log10, pow, sqrt \(mi exponential, logarithm, power, square root
                      5: .SH SYNOPSIS
                      6: .nf
                      7: .B #include <math.h>
                      8: .PP
                      9: .B double exp(x)
                     10: .B double x;
                     11: .PP
                     12: .B double log(x)
                     13: .B double x;
                     14: .PP
                     15: .B double log10(x)
                     16: .B double x;
                     17: .PP
                     18: .B double pow(x, y)
                     19: .B double x, y;
                     20: .PP
                     21: .B double sqrt(x)
                     22: .B double x;
                     23: .fi
                     24: .SH DESCRIPTION
                     25: .I Exp
                     26: returns the exponential function of
                     27: .I x.
                     28: .PP
                     29: .I Log
                     30: returns the natural logarithm of
                     31: .IR x ;
                     32: .I log10
                     33: returns the base 10 logarithm.
                     34: .PP
                     35: .I Pow
                     36: returns
                     37: .I  x\u\s8y\s10\d.
                     38: .PP
                     39: .I Sqrt
                     40: returns the square root of
                     41: .I x.
                     42: .SH SEE ALSO
                     43: .IR hypot (3),
                     44: .IR sinh (3),
                     45: .IR intro (2)
                     46: .SH DIAGNOSTICS
                     47: .I Exp
                     48: and
                     49: .I pow
                     50: return a huge value when the correct value would
                     51: overflow;
                     52: .I errno
                     53: is set to
                     54: .BR ERANGE .
                     55: .I Pow
                     56: returns 0 and sets
                     57: .I errno
                     58: to
                     59: .B EDOM
                     60: when the second argument is negative and non-integral and
                     61: when
                     62: both arguments are 0.
                     63: .PP
                     64: .I Log
                     65: returns a huge negative value when
                     66: .I x
                     67: is zero or negative;
                     68: .I errno
                     69: is set to
                     70: .BR EDOM .
                     71: .PP
                     72: .I Sqrt
                     73: returns 0 when
                     74: .I x
                     75: is negative;
                     76: .I errno
                     77: is set to
                     78: .BR EDOM .

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