May 19th, 2017, 09:44 PM  #1 
Newbie Joined: May 2017 From: North America Posts: 7 Thanks: 0  Trigonometric Identities
1. Determine the nonpermissible 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. I'm awful at this 
May 19th, 2017, 09:55 PM  #2 
Senior Member Joined: Sep 2015 From: Southern California, USA Posts: 1,602 Thanks: 816 
1) you can't have $0$ in any denominators 2) no, identities hold for all values of $\theta$ 

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