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Checking it at several values of x could lend some validity to it.
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Checking it at several values of x could lend some validity to it.

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Or verify the double angle tangent identity here: <br />
<a href="http://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities#Double-angle_identities" rel="ugc">http://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities#Double-angle_identities</a><br />
and apply it twice
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Or verify the double angle tangent identity here:
http://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities#Double-angle_identities [http://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities#Double-angle_identities]
and apply it twice

trig.jpg

How can I verify this identity?

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