Question

tan 4 theta=4 tan theta (1-tan^2 theta)/1-6 tan^2 theta +tan^4 theta

Answer 1

Note that tan(x+y) = (tan x + tan y)/(1 - tan x tan y). Letting y = x yields the double angle identity tan(2x) = 2 tan x/(1 ...

Answer 2

please write it properly