Find the modulus and argument of
The Attempt at a Solution
1) So for question 1 i tried
cos(i) = ½(ei2 + e-i2) = ½(e-1 + e) . However this doesn't (as far as I can see!) lead me to the right answer. I was aiming to get it in the form reix where r is the modulus and x the argument.
for 2) I basically just drew an argand diagram and found the radius to be 3 and the argument 3/4pi.
if you could point me in the right direction with 1 especially that would be greatly appreciated!