Arthur D. answered 10/19/17
Tutor
5.0
(150)
Forty Year Educator: Classroom, Summer School, Substitute, Tutor
(tanθ+cotθ)^2=sec^2θ+csc^2θ
tan^2θ+2tanθcotθ+cot^2θ=
tan^2θ+2tanθ(1/tanθ)+cot^2θ=
tan^2θ+2+cot^2&theta=;
substitute
sec^2θ-1+2+csc^2θ-1=
sec^2θ+csc^2θ
Arthur D.
10/19/17