Let z1=x1+y1i

Let z1=x1+y1i and z2=x2+y2i
Find:
a = Im (z1z2)
b = Re (z1/z2)

Result

a = (Correct answer is: x1*y2+y1*x2-y1*y2) Wrong answer
b =  0

Solution:

z1=x1+y1i z2=x2+y2i   a=Im(z1⋅ z2) a=x1⋅ y2+y1⋅ x2−y1⋅ y2

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