COS function
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
