I just cant get it.

Trig identities:

4 tan(x) = 2tan(2x)/2-sec^2(x)

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- November 5th 2006, 07:50 PM #1

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- Nov 2006
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- November 6th 2006, 04:51 AM #2

- November 8th 2006, 08:02 PM #3

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- Nov 2006
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