Posted by krista on Thursday, May 6, 2010 at 11:12pm.
show that: (1tanx)/(1+tanx)= (1sinx)/(cos2x)

Precal  drwls, Friday, May 7, 2010 at 6:32am
Is the denominator on the right cos(2x) or cos^2x ? Neither seems to work.
If x = pi/4, the left side is 0 and the right side is 0.293/0 = infinity, if the denominator is cos 2x.
Therefore what you wrote is not an identity.
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