Let z1=x1+y1i

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

Correct answer:

a = x1*y2+y1*x2-y1*y2
b =  0

Step-by-step explanation:

z1=x1+y1i z2=x2+y2i  a = Im (z1   z2) a=x1 y2+y1 x2y1 y2

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