I need equation for this: sinx/(1-cosx) + tan x/(1 + cosx). The answer must be (cos^2x + 1)/(sinx cosx).has something to do with verifying identities.

If you convert the tanx to sinx/cosx, then with a little algebraic manipulation you can get the left hand side to be equal to the right hand side. Hint - multiply the first fraction on the left hand side by (1+cosx)/(1+cosx) and the second fraction by (1-cosx)/(1-cosx), then combine.