Therefore, to find \(\frac{z_1}{z_2}\) , we have to multiply \(z_1\) with the multiplicative inverse of \(z_2\). 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Addition 2. By the definition of addition of two complex numbers, Note: Conjugate of a complex number z=a+ib is given by changing the sign of the imaginary part of z which is denoted as \( \bar z \). Instead of polynomials with like terms, we have the real part and the imaginary part of a complex number. Consider two complex numbers z1 = a1 + ib1 and z2 = a2 + ib2. 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