I really, really need to know the formula that adds (or subtracts) two complex numbers in polar form, and NOT in rectangular form. I know there is such formula (I saw it in some book), and it's composed of cosines and sines. Please, please don't tell me to convert back to rectangular form, add them, then covert them back to polar form--that's not what I'm looking for. I'm looking for a formula that accepts two complex numbers in polar form, adds them, and gives the answer in polar form. Thank you.