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May 19th, 2017, 09:44 PM   #1
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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.

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May 19th, 2017, 09:55 PM   #2
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1) you can't have $0$ in any denominators

2) no, identities hold for all values of $\theta$
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