Function acos

Calculate the inverse cosine of a value.

For matrices, the function is evaluated element wise.

Syntax

acos(x)

Parameters

Parameter Type Description
x number | BigNumber | Complex | Array | Matrix Function input

Returns

Type Description
number | BigNumber | Complex | Array | Matrix The arc cosine of x

Examples

acos(0.5);           // returns number 1.0471975511965979
acos(cos(1.5)); // returns number 1.5

acos(2);             // returns Complex 0 + 1.3169578969248166 i

See also

cos, atan, asin