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

complex sin




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

Return Value

Returns the complex sine of z.


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

import cmath

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

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

The output of the above code will be:

cmath.sin(z1): (3.4209548611170133-1.5093064853236158j)
cmath.sin(z2): (0.9092974268256817-0j)
cmath.sin(z3): 3.626860407847019j

❮ Python cMath Module