Question

value of cos2 theta in terms of cot they..

Answer 1

see this or you can you tan2a formula in terms of see 2nd pic

Answer 2

$\boxed{Hai\:Gd\:Morning}$

According to standard result

cos2x=1-tan^2x/1+tan^2x

So cos2 x=cot^2x+1/cot^2x-1

I think so but I am not sure

Hope it helps you
THANK YOU

$\pink{KEERTHY}$