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 May 19th, 2017, 08:44 PM #1 Newbie   Joined: May 2017 From: North America Posts: 7 Thanks: 0 Trigonometric Identities 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. I'm awful at this
 May 19th, 2017, 08:55 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,529 Thanks: 1389 1) you can't have $0$ in any denominators 2) no, identities hold for all values of $\theta$ Thanks from SN2

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