Question

PLEASE HELP!
Prove algebraically that the equation is an identity.
(1/1-cosB) + (1/1+cosB)=2csc^2B

Answer 1

{(1+cosB)/[(1-cosB)(1+cosB)]} + {(1-cosB)/[(1-cosB)(1+cosB)]}
(1+cosB+1-cosB) / [(1-cosB)(1+cosB)]
2/(1-cos^2(B))
2/sin^2(B)
2csc^2(B)