Can you please help me with problems 15 and 18 based on the worksheet below? Thanks so much!

AT&T S 9:45 PM 32% It turns out that it is often easier to calculate with the polar form of a complex number due to a striking relationship between exponential functions, trigonometric functions and complex numbers. Euler's Formula: els = cos 0 + isin 0 Thus, from equation (8), any complex number can be written in the form z = re", for r 2 0 and 0 5 0