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Coordinate Transformation (Polar Coordinates → Cartesian Coordinates)

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Converts the polar representation reθi of a complex number to the Cartesian representation x+yi.
Polar coordinates:
r 
,
θ 
Cartesian coordinates:
 x+yi  
\(\normalsize (1)\ Cartesian\ coordinates:\ x+yi\\ \hspace{60px}x=r\cos\theta,\hspace{20px}y=r\sin\theta\\ (2)\ Polar\ coordinates:\ re^{{\theta}i}\\ \hspace{60px}r=\sqrt{x^2+y^2},\hspace{20px}\theta=\tan^{\small-1}{\large\frac{y}{x}}\\\)

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