Hey so I was able to solve the first 2 now working on number 3. I will do these one by one to clear confusion. tan^2(x)sin^2(x)=tan^2(x)+cos^2(x)-1 3.) I started to work with the right hand side since it had an addition sign and looked ugly. First, I converted (cos^2(x)-1) to -sin^2(x) so i had now ...