# cos()

cos(x) returns cos x. Input number is in radian
``````import math
print(math.cos(1))       # 0.5403023058681398
print(math.cos(0.56))    # 0.8472551110134161
print(math.cos(-0.56))   # 0.8472551110134161
print(math.cos(-1))      # 0.5403023058681398
print(math.cos(0))       # 1.0
print(math.cos(math.pi)) # -1.0``````
Note that all the inputs are in radian.

## Inputs in degree

We can convert radian value to degree and use the same
``````import math
in_degree = 90
print(math.cos(in_redian))     # 6.123233995736766e-17``````

## Drawing graph of cos()

Using this we will use Matplotlib to generate graph of cos
``````import matplotlib.pyplot as plt
x=[]
y=[]
i=0
while (i<=8):
x.append(i)
y.append(math.cos(i))
i=i+0.1
plt.plot(x,y)
plt.axvline(x=0.00,linewidth=2, color='#f1f1f1')
plt.axhline(y=0.00,linewidth=2, color='#f1f1f1')
plt.grid(linestyle='-', linewidth=0.5,color='#f1f1f1')
plt.show()``````

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