cosine

cos

Cosine

Syntax

*

Y = cos(X)

Description

The cos function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians.

Y = cos(X) returns the circular cosine for each element of X.

Examples

Graph the cosine function over the domain .

*

x = -pi:0.01:pi;
plot(x,cos(x)), grid on



The expression cos(pi/2) is not exactly zero but a value the size of the floating-point accuracy, eps, because pi is only a floating-point approximation to the exact value of
.

Definition

The cosine can be defined as