CUSAT 2019 BTech Solved Paper

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Question : 105 of 250

Marks: +1, -0

If z1 and z2 are any two complex numbers, then Re(z1z2) is

Re(z1)‌Re(z2)+Im(z1)‌Im(z2)
Re(z1)‌Re(z2)−Im(z1)‌Im(z2)
Re(z1)‌Im(z2)+Re(z2)‌Im(z1)
Re(z1)‌Im(z1)−Re(z2)‌Im(z2)

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