Multiply z1=2(cosfracpi6+isinfracpi6)z_1 = 2(\\cos \\frac{\\pi}{6} + i \\sin \\frac{\\pi}{6})z1=2(cosfracpi6+isinfracpi6) and z2=3(cosfracpi3+isinfracpi3)z_2 = 3(\\cos \\frac{\\pi}{3} + i \\sin \\frac{\\pi}{3})z2=3(cosfracpi3+isinfracpi3).
6(cosfracpi2+isinfracpi2)=6i6(\\cos \\frac{\\pi}{2} + i \\sin \\frac{\\pi}{2}) = 6i6(cosfracpi2+isinfracpi2)=6i
6(cosfracpi3+isinfracpi3)6(\\cos \\frac{\\pi}{3} + i \\sin \\frac{\\pi}{3})6(cosfracpi3+isinfracpi3)
5(cosfracpi2+isinfracpi2)5(\\cos \\frac{\\pi}{2} + i \\sin \\frac{\\pi}{2})5(cosfracpi2+isinfracpi2)
6(cospi+isinpi)=−66(\\cos \\pi + i \\sin \\pi) = -66(cospi+isinpi)=−6