If `(1+i cos theta)/(1-2i cos theta)` is purely imaginary then `theta` =

(3+2i sin theta)/(1-2i sin theta) will be purely imaginary,then find theta

(3+2i sin theta)/(1-2i sin theta) will be purely imaginary,then find theta?

Let A={theta in (-pi /2,pi):(3+2i sin theta )/(1-2 isin theta ) is purely imaginary } Then the sum of the elements in A is

Find the real values of theta for which the complex number (1+i cos theta)/(1-2i cos theta) is purely real.

The real value of theta for which the expression (1+i cos theta)/(1-2i cos theta) is real number is

The real value of theta for which the expression (1 + icos theta)/(1 - 2i cos theta) is real number is

1 + cos theta + i sin theta | =?