Here are the trigonometric functions in C:

**sin function:** It is used to return sine of an argument.

Syntax:

float sin(float x);

**cos function:** It is used to return cosine of an argument.

Syntax:

float cos(float x);

**tan function:** It is used to return tangent of an argument.

Syntax:

float tan(float x);

**asin function:** It is used to return arc sine of an argument.

Syntax:

float asin(float x);

**acos function:** It is used to return arc cosine of an argument.

Syntax:

float acos(float x);

**atan function:** It is used to return arc tangent of an argument.

Syntax:

float atan(float x);

**atan2 function:** It is used to return arc tangent of a/b.

Syntax:

float atan2(float a, float b);

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