The inverse of a tangent function is arctan or inverse tan or atan. i.e., tan-1 = arctan. The value of tangent function varies from -∞ to +∞. Enter the value into the calculator, the atan of the entered value will be displayed in either degrees or radians.
Let us consider the value of x as 23
Atan(23) = tan-1(23)
The value of Atan(23) is 87.5104 degrees
The value of Atan(23) is 1.5273 radians
1 ° = 0.0174532925 radians