Mathematics.

Routine Use
acos Calculate arccosine
asin Calculate arcsine
atan Calculate arctangent
atan2 Calculate arctangent
ceil Calculate integer ceiling
_chgsign Invert the sign of a floating point number
_copysign Copy the sign from one floating point to another
cos Calculate cosine
cosh Calculate hyperbolic cosine
cot Calculate cotangent
exp Calculate exponential function
fabs Calculate absolute value
floor Calculate largest integer less than or equal to argument
fmod Calculate floating-point remainder
frexp Calculate exponential value
ldexp Calculate product of argument and 2 to specified power
log Calculate natural logarithm
log10 Calculate base-10 logarithm
modf Split argument into integer and fractional parts
pow Calculate value raised to a power
sin Calculate sine
sinh Calculate hyperbolic sine
sqrt Calculate square root
tan Calculate tangent
tanh Calculate hyperbolic tangent