COS function

Description

Cosine function. COS(x) returns the cosine of an angle x. The result range is [-1..1]. The argument x must be expressed in radians. To convert degrees to radians you use the RADIANS function.

Sine, Cosine, and Tangent in unit circle

The argument x can be a real number, a complex number, or a matrix. When it is a matrix, the function returns a matrix with the same dimensions and with the COS function applied to all elements.

Examples

COS(PI()/3) equals 0.5.

COS(RADIANS(90)) equals 0.

COS(3.14159265) equals -1.

Calculator

Graph

Related functions

• ACOS function: returns the arc cosine of a number.
• PI function: returns value of PI.
• RADIANS function: converts degrees into radians.
• Trigonometric functions

External links

• Trigonometric functions on Wikipedia.