Question

Find the product of z₁​ and z₂​, where z₁​=2(cos 80∘+i sin 80∘) and z₂​=9(cos 110∘+i sin110∘).
a) 11(cos 190°+isin 190°)
b) 18(cos 8800°+isin 8800°)
c) 18(cos 190°+isin 190°)
d) 18(cos 80°+isin 80°)