Question

Please friends someone solve the CET problem if u know 1 answer also plss

Who will answer this i will give them chocolate​

Answer 1

Answer:

option no 4 is correct pls mark me as braniliest

Answer 2

Step-by-step explanation:

We have, (1−cosθ+isinθ)−1

=11−cosθ+isinθ

=1−cosθ−isinθ(1−cosθ)2+sin2θ

=1−cosθ−isinθ1−2cosθ+cos2θ+sin2θ

=1−cosθ−i,sinθ2−2cosθ

=1−cosθ2(1−cosθ)−isinθ2(1−cosθ)

=12−isinθ2(1−cosθ)

Hence, the real part is

$\frac{1}{2}$