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Question

If z1 and z2 are two complex numbers such that z1=z2 and arg(z1) + arg(z2) = π, then show that z1=-z2¯.

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Solution

Let θ1 be the arg(z1) and θ2 be the arg(z2).

It is given that z1=z2 and arg(z1) + arg(z2) = π.

Since, z1 is a complex number.

z1=z1cosθ1+isinθ1 =z2cosπ-θ2+isinπ-θ2 =z2-cosθ2+isinθ2 =-z2cosθ2-isinθ2 =-z2¯

Hence, z1=-z2¯.

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