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Mathematics, 21.10.2019 17:30 Geo777

Let z1 = a1 + b1i, z2 = a2 + b2i, and z3 = a3 + b3i. prove the folowing using algebra or by showing with vectors.
a. z1 + z2 = z2 + z1
b. z1 + (z2 + z3) = (z1 + z2) + z3

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