Question

if z=r (cosΦ+sinΦ), then the value of z/z+z/z is. options A. cos2Φ B. 2cos2Φ C. 2cosΦ D. 2sin Φ​

Answer 1

Answer:

z=cosθ+isinθ=e

iθ

z

2n−1

=z

2n−1−2n−1

=z

−2

=(e

iθ

)

−2

=e

−2iθ

=cos2θ−isin2θ