atan()

atan(x) returns arc tan of x. Input number is in radian
import math
print(math.atan(0))      # 0.0
print(math.atan(0.1))    # 0.09966865249116204
print(math.atan(0.5))    # 0.4636476090008061
print(math.atan(1.5))    # 0.982793723247329
print(math.atan(10))     # 1.4711276743037347
print(math.atan(50))     # 1.550798992821746
print(math.atan(500))    # 1.5687963294615568
Note that all the inputs are in radian.
Using negative input value
import math
print(math.atan(-0.1))    # -0.09966865249116204
print(math.atan(-0.5))    # -0.4636476090008061
print(math.atan(-1.5))    # -0.982793723247329
print(math.atan(-10))     # -1.4711276743037347
print(math.atan(-50))     # -1.550798992821746
print(math.atan(-500))    # -1.5687963294615568

Inputs in degree

We can convert radian value to degree and use the same
import math
in_degree = 57
in_redian = math.radians(in_degree)
print(math.atan(in_redian))
Output
0.782810326348054
1 radian = 57.2957914331 degree
1 degree = 0.0174533 radian

Drawing graph of atan()

In our Trigonometric language atan is also know as arctan. Using this we will use Matplotlib to generate graph of atan atan graph
import matplotlib.pyplot as plt
x=[]
y=[]
i=-1
while (i<=1):
    x.append(i)
    y.append(math.atan(i))
    i=i+0.01
plt.plot(x,y)    
plt.show()
acos() asin() sin() tan()

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