Question

how to convert z = 2(cos60 + isin60) to rectangular form

Answer 1

for this you only need
\[\cos(60)=\frac{1}{2}\] adn
\[\sin(60)=\frac{\sqrt{3}}{2}\] plug em in

Answer 2

then multiply by 2 and get
\[1+\sqrt{3}i\]

Answer 3

going the other way is harder, but changing from trig form to rectangular means evaluate the trig functions