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= { 2 cos 2x sin x)/(- 2 sin 2x sin x)
= - cos 2x/ sin 2x
= - cot 2x
= - 1/ tan 2x
.
tan 2x = 2 tan x / ( 1- tan^2 x) = 2p / (1-p^2)
.
- 1/ tan 2x = - (1- p^2) / (2p)
(sin 3x-sinx)/(cos 3x - cosx) = - (1 - p^2)/ (2p)