Python cmath - cos() Function
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:
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 example below, 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
