Question

question will be attached :)

Answer 1

@mahmit2012 can u plz help me?

Answer 2

z1= 5(cos 15+ i sin 70) times z2= 3(cos 70 + i sin 15)

z1 times z2 = 5times 3
= 15 ( cos (15+70) + i sin (70 +15) )
=15( cos 85 + i sin 85)

the answer is D