# math.cos() method with example in Python

Python math.cos() method: Here, we are going to learn about the math.cos() method with example in Python.
Submitted by IncludeHelp, on April 21, 2019

## Python math.cos() method

math.cos() method is a library method of math module, it is used to get the cosine of the number radians, it accepts a number returns the cosine of the given number radians.

Note: math.cos() method accepts the only number, if we provide anything else except the number, it returns error TypeError - "TypeError: a float is required".

Syntax of math.cos() method:

```    math.cos(x)
```

Parameter(s): x – is the number whose cosine to be calculated.

Return value: float – it returns a float value that is the cosine value of the number x radians.

Example:

```    Input:
a = 0.278

# function call
print(math.cos(a))

Output:
0.9616062271291891
```

### Python code to demonstrate example of math.cos() method

```# python code to demonstrate example of
# math.cos() method

# importing math module
import math

# number
a = -1
print("cos(",a,") is = ", math.cos(a))

a = 0
print("cos(",a,") is = ", math.cos(a))

a = 0.278
print("cos(",a,") is = ", math.cos(a))

a = 1
print("cos(",a,") is = ", math.cos(a))
```

Output

```cos( -1 ) is =  0.5403023058681398
cos( 0 ) is =  1.0
cos( 0.278 ) is =  0.9616062271291891
cos( 1 ) is =  0.5403023058681398
```

TypeError example

```# python code to demonstrate example of
# math.cos() method with an exception

# importing math module
import math

# number
a = "2"
print("cos(",a,") is = ", math.cos(a))
```

Output

```Traceback (most recent call last):
File "/home/main.py", line 9, in <module>
print("acos(",a,") is = ", math.acos(a))
TypeError: a float is required
```

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