Facebook Page Twitter Page LinkedIn Page
× Python Tutorial Python Advanced Python Resources Python Libraries


The Python cmath.cos() function returns complex cosine of a complex number z. It is a function on complex plane, and has no branch cuts. Mathematically, it can be expressed as:

complex cos

Syntax

cmath.cos(z)

Parameters

z Required. Specify the complex number, representing an angle expressed in radians.

Return Value

Returns the complex cosine of z.

Example:

In the below example, cos() function is used to find out the complex cosine of the given number.

import cmath

z1 = 2 + 2j
z2 = 2
z3 = 2j

print("cmath.cos(z1):", cmath.cos(z1))
print("cmath.cos(z2):", cmath.cos(z2))
print("cmath.cos(z3):", cmath.cos(z3))

The output of the above code will be:

cmath.cos(z1): (-1.5656258353157435-3.297894836311237j)
cmath.cos(z2): (-0.4161468365471424-0j)
cmath.cos(z3): (3.7621956910836314-0j)

❮ Python cMath Module

5