#3:
You got it to
Use sin and cos:
1. sin (x) (cos^2 (x)) - sin (x)
My answer: -sin^3 (x)
2. sin (x) + cot (x) (cos (x))
My answer: csc (x)
3. (sec^2 (x) - 1) / sec^2 (x)
I only go to the part where its
(tan^2 (x)) / 1 + tan^2 (x)
i dont know what to do now..
Thank you once again