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## Homework Statement

Establish associative law of multiplication by considering absolute values and arguements.

z1(z2z3)=(z1z2)z3

## Homework Equations

## The Attempt at a Solution

I think I need to use r(costheta +isintheta)

r1(costheta1+isintheta1)[r2r3(costheta2+isintheta2)(costheta3+isintheta3)]=

Is this just a bunch of multiplying out and showing it's the same?