1. Determine the non-permissible values of the identity (1/sinx)(1/cosx)=tan x + (1/tan x)

2. The equation (tan^2 θ)/(1+tan^2 θ) =sin^2 θ is true when θ=30° and when θ=135°. Does this mean that the equation is an identity? Why or why not.

Did you read about posting homework? This pertains to your first question too.