The most general value of θ satisfying the equation (cosθ + i sinθ) (cos 22θ + i sin 22θ) …..(cos n2θ + i sin n2θ) = –i, is given by
(a) [3(4k–1)p] / [n(n+1)(2n+1)]
(b) [3(4k+1)p] / [n(n+1)(2n+1)]
(c) [6(2k–1)p] / [n(n+1)(2n+1)]
(d) [6(2k+1)] / [n(n+1)(2n+1)]