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Python - math.atan() function - GeeksforGeeks

Last Updated : 28 May, 2020

contains a number of functions which is used for mathematical operations. The

function returns the arctangent of a number as a value. The value passed in this function should be

radians.

Syntax: math.atan(x) Parameter:This method accepts only single parameters.

• x :This parameter is the value to be passed to atan()

Returns:This function returns the arctangent of a number as a value.

Below examples illustrate the use of above function:

# Python code to implement
# the atan()function

# importing "math"
# for mathematical operations  
import math   
    
a = math.pi / 6
     
# returning the value of arctangent  of pi / 6  
print ("The value of tangent of pi / 6 is : ", end ="")  
print (math.atan(a))  

The value of tangent of pi / 6 is : 0.48234790710102493

# Python code to implement
# the atan()function
import math 
import numpy as np 
import matplotlib.pyplot as plt  
   
in_array = np.linspace(0, np.pi, 10)  
   
out_array = [] 
   
for i in range(len(in_array)): 
    out_array.append(math.atan(in_array[i])) 
    i += 1
      
print("Input_Array : \n", in_array)  
print("\nOutput_Array : \n", out_array)   
 
plt.plot(in_array, out_array, "go:")  
plt.title("math.atan()")  
plt.xlabel("X")  
plt.ylabel("Y")  
plt.show()  

Input_Array : 
 [0.         0.34906585 0.6981317  1.04719755 1.3962634  1.74532925
 2.0943951  2.44346095 2.7925268  3.14159265]

Output_Array : 
 [0.0, 0.3358423725664079, 0.6094709714274295, 0.808448792630022, 0.9492822422213403, 1.0504981725497873, 1.1253388328842984, 1.1823365638628716, 1.2269249964859286, 1.2626272556789118]

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