Mathematical Functions < math.h>

Trigonometric:

sin
sine
cos
cosine
tan
tangent
asin
arc sine
acos
arc cosine
atan
arc tangent, range first quadrant
atan2
arc tangent, range two quadrants

Hyperbolic:

sinh
hyperbolic sine
cosh
hyperbolic cosine
tanh
hyperbolic tangent

Logarithmic:

exp
exponential
log
natural logarithm
log10
base 10 logarithm

Power and Square-Root:

pow
yth power of x
sqrt
square root

Rounding:

ceil
smallest whole number greater than x
floor
largest whole number less than x

Others:

fabs
absolute value of a floating point
ldexp
generates a base 2 fraction times an exponent
frexp
splits a number into a base 2 fraction and an exponent
modf
splits a number into fractional and integral parts
fmod
floating point remainder of x / y, x and y are double