how to convert tangent function to degrees?

Question

I have seen in a book that:

$\exp (j*\tan^{-1}(4/3))=\exp (j*53.1)$, where $53.1$ is in degrees

How did he reach that value?

Note that $\tan^{-1}(4/3)$ can be seen also as $1/\tan (3/4)$

Answer 1

OK so i found out on my own with the help of matlab !! Matlab is a great tool who saved me !

So the arctan(3/4) is the value in radians whos tangent equals arctan(3/4) arctan(4/3) = 0.927295218

Matlab helped a lot !