1. The problem statement, all variables and given/known data Rewrite sin^4 xtan^4 x in terms of the 1st power of the cosine. 2. Relevant equations sin^2 x=(1-cosx)/2 tan^2 x=(1-cosx)/(1+cosx) 3. The attempt at a solution For this problem, I tried to rewrite tan^2 x as (sin^2 x/cos^2 x) But then I ended up with a...cubic function, which made the problem even more complicated. What am I doing wrong here?