**cmath.sin() Method in Python:**

The sine of a number is returned by the cmath.sin() method.

Sine is a trigonometric function that represents the ratio of a right triangle’s opposite side to its hypotenuse.

**Syntax:**

cmath.sin(x)

**Parameters**

**x:** This is Required. It is a number that can be used to calculate the sine of

**Return Value:**

Returns a complex value that denotes the sine of a complex number.

**Examples:**

**Example1:**

**Input:**

Given Complex Number = 3+4j

**Output:**

The given complex number's (3+4j) sine value = (3.853738037919377-27.016813258003932j)

**Example2:**

**Input:**

Given realpart = 5 Given imaginary part = 2

**Output:**

The given complex number's (5+2j) sine value = (-3.6076607742131563+1.0288031496599335j)

**Note:** The above input format is for dynamic input.

## cmath.sin() Method with Examples in Python

### Method #1: Using Built-in Functions (Static Input)

**Approach:**

- Import cmath module(for complex number operations) using the import keyword.
- Give the complex number as static input and store it in a variable.
- Pass the given complex number as an argument to the cmath.sin() method that returns the given complex number’s sine value.
- Store it in another variable.
- Print the sine value of the given complex number.
- The Exit of the Program.

**Below is the implementation:**

# Import cmath module(for complex number operations) using the import keyword. import cmath # Give the complex number as static input and store it in a variable. complexnumb = 3+4j # Pass the given complex number as an argument to the cmath.sin() method that # returns the given complex number's sine value. # Store it in another variable. rslt = cmath.sin(complexnumb) # Print the sine value of the given complex number. print("The given complex number's", complexnumb, "sine value = ") print(rslt)

**Output:**

The given complex number's (3+4j) sine value = (3.853738037919377-27.016813258003932j)

Similarly, try for the other examples

import cmath complexnumb = -1-2j rslt = cmath.sin(complexnumb) print("The given complex number's", complexnumb, "sine value = ") print(rslt)

**Output:**

The given complex number's (-1-2j) sine value = (-3.165778513216168-1.9596010414216063j)

### Method #2: Using Built-in Functions (User Input)

**Approach:**

- Import cmath module(for complex number operations) using the import keyword.
- Give the real part and imaginary part of the complex number as user input using map(), int(), split().
- Store it in two variables.
- Using a complex() function convert those two variables into a complex number and store them in a variable.
- Pass the given complex number as an argument to the cmath.sin() method that returns the given complex number’s sine value.
- Store it in another variable.
- Print the sine value of the given complex number.
- The Exit of the Program.

**Below is the implementation:**

# Import cmath module(for complex number operations) using the import keyword. import cmath # Give the real part and imaginary part of the complex number as user input # using map(), int(), split(). # Store it in two variables. realnumb, imaginarynumb = map(int, input( 'Enter real part and complex part of the complex number = ').split()) # Using a complex() function convert those two variables into a complex number. complexnumb = complex(realnumb, imaginarynumb) # Pass the given complex number as an argument to the cmath.sin() method that # returns the given complex number's sine value. # Store it in another variable. rslt = cmath.sin(complexnumb) # Print the sine value of the given complex number. print("The given complex number's", complexnumb, "sine value = ") print(rslt)

**Output:**

Enter real part and complex part of the complex number = 5 2 The given complex number's (5+2j) sine value = (-3.6076607742131563+1.0288031496599335j)