Write in the polar form ,.

a)

I know that I should use this: (e^a)(cosb+isinb)

Which is: (e^4)(cos1+isin1)

But then what? How do I get 7e^(a+i) into a+bi form?

*To be more precise what are r=? and theta=? (without decimals)

b)

For question b r=

But does Theta equal? I got but it's wrong.

If there are other posts that could help please feel free to send me links.