Answer
16$(cos50^\circ + i sin50^\circ)$
Work Step by Step
$w = 8(cos40^\circ + i sin40^\circ)$ = $8cis40^\circ$ and
$z = 2(cos10^\circ + i sin10^\circ)$ = $2cis10^\circ$
wz
= ($8cis40^\circ$)($2cis10^\circ$)
= 16$cis(40^\circ + 10^\circ)$ Product Theorem
= 16$(cos50^\circ + i sin50^\circ)$
