Find the product of z1 and z2 where z1 = 7(cos 40° + i sin 40°), and z2 = 6(cos 145° + i sin 145°).
(a) 42(cos 40° + i sin 40°)
(b) 42(cos 185° + i sin 185°)
(c) 13(cos 185° + i sin 185°)
(d) 42(cos 5800° + i sin 5800°)
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Verified answer
z1*z2=42(cos40*cos145+isin40cos145 +isin145cos40-sin145sin40)=42(cos185 +isin185)=
(b). You forgot DeMovrie's thm!!!