Pre Cal.
posted by Jeremy .
Express 5sqrt(3)  5i in polar form.
A: 10(cos(11pi/6) + i sin(11pi/6))
Express 4(cos(3pi/4) + i sin(3pi/4)) in rectangular form.
A: 2sqrt(2) + 2sqrt(2i
Write 2x+y=5 in polar form.
A: sqrt(5)= r cos (theta27degrees)
Are these correct?

none of them are correct.