I have missedeEvery trig unit ever in school by accident and I just always winged the tests but now I've worked so hard to keep a 90% average (normally i get like a 68% in math) I just don't want it to drop. I have an assignment where I have to complete over 30 questions and get them perfect. I am not asking you to complete the assignment for me but if I post an example of a few could you show me what your doing to get the answer so I can look off that and use it to help me do the rest that would be great. By the way it's proving trig identities.

4.cos^2=sin^2+cos^2-1

15. sin+tan=tan(1+cos)

22.sec^4-tan^4=1+2tan^2

28. sec^2-sin^2=cos^2+tan^2

If you could help i would help me soo much!!