The C language provides a number of library functions that carry out mathematical operations such as square root, sine, cosine, tan, and various other actions. These functions, which are part of C mathematical library are called mathematical library functions. They are also called mathematical built in functions.
Brief description about each mathematical function is available in your program's header file called “math.h”. Therefore, anyone who uses mathematical functions should include “math.h” in the beginning of the program. The various mathematical functions which are commonly used are provided below:
Function
with return type

Operations
performed

abs(int
i)

Returns
absolute value of an integer.

cos(x)

Returns
the cosine value of x.

acos(x)

Returns
the inverse cosine of an angle where x is in radians.

sin(x)

Returns
the sine value of x.

asin(x)

Returns
the inverse sine of an angle where x is in radians.

tan(x)

Returns
the tangent of an angle where x is in radians.

atan(x)

Returns
the inverse tangent of an angle where x is in radians.

exp(x)

Returns
the value of e to the power x.

fabs(x)

Returns
the absolute value of floating point number x.

log(x)

Returns
the natural logarithm of x.

log10(x)

Returns
the logarithm of x to the base of 10.

pow(x,y)

Returns
the value of x to the power y.

sqrt(x)

Returns
the square root of x.

These functions are given here to just start with programming. In most of the general or mathematical problems such built in functions are regularly used. We will discuss about examples about each of these functions later.
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