Question

Convert the following to rectangular form:
2(cos(135)+isin(135))
3(cos(120)+isin(120))
5(cos(5π/4)+isin(5π/4))
4(cos(5π/3)+isin(5π/3))

Answer 1

\[re^{i\theta} = r(\cos\theta+i\sin\theta)=r(\cos\theta,\, \sin\theta)=(r\cos\theta,\, r\sin\theta)\]

Answer 2

are you clear on that 11SAAT?