C Programming: Mathematical Functions

Functions	Meaning
Trigonometric
acos(x)	Arc cosine of x
asin(x)	Arc sine of x
atan(x)	Arc tangent of x
atan 2(x,y)	Arc tangent of x/y
cos(x)	Cosine of x
sin(x)	Sine of x
tan(x)	Tangent of x
Hyperbolic
cosh(x)	Hyperbolic cosine of x
sinh(x)	Hyperbolic sine of x
tanh(x)	Hyperbolic tangent of x
Other Functions
ceil(x')	x rounded up to nearest integer
exp(x)	e to the power x (e^x)
fabs(x)	Absolute value of x
floor(x)	x rounded down to the nearest interger
fmod(x,y)	Remainder of x/y
log(x)	Natural log of x, x>0
log10(x)	Base 10 log of x, x>0
pow(x,y)	x to the power y
sqrt(x)	Square of x, x>=0

Remember this: To use Math functions in C program, you mush include header file #include<math.h>