Function cos
Calculate the cosine of a value.
For matrices, the function is evaluated element wise.
Syntax
cos(x)
Parameters
Parameter | Type | Description |
---|---|---|
x |
number | BigNumber | Complex | Unit | Array | Matrix | Function input |
Returns
Type | Description |
---|---|
number | BigNumber | Complex | Array | Matrix | Cosine of x |
Examples
cos(2); // returns number -0.4161468365471422
cos(pi / 4); // returns number 0.7071067811865475
cos(unit(180, 'deg')); // returns number -1
cos(unit(60, 'deg')); // returns number 0.5
var angle = 0.2;
pow(sin(angle), 2) + pow(cos(angle), 2); // returns number ~1