which statements are true select all that apply
A) tan^2 theta=1-sec^2theta
B) cos theta= cot theta/ csc theta
C) 1/ sec^2 theta= sin^2 theta +1
D) sec^2 theta-1= 1/ cot^2 theta
E) sin theta csc theta= tan theta
A) tan^2 theta=1-sec^2theta
C) 1/ sec^2 theta= sin^2 theta +1