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posted by Joe Monday, April 12, 2010 at 8:41am.
Verify the following identity 2 tan x/1+tan^2 x = sin 2x
One of the variations of sin^x + cos^x = 1 is 1 + tan^2x = sec^2x so LS = [2(sinx/cosx)]/sec^2x = (2sinx/cosx)(1/cos^2x) = 2sinxcosx = sin 2x = RS
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