cos() math function to get cos of input number in radian in Python

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
in_redian = math.radians(in_degree)
print(math.cos(in_redian))     # 6.123233995736766e-17

1 radian = 57.2957914331 degree
1 degree = 0.0174533 radian

Drawing graph of cos()

Using this we will use Matplotlib to generate graph of cos $cos graph$

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()

acos() asin() sin() tan()
Drawing sin and cos curves on Tkinter Canvas

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Subhendu Mohapatra

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