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pradnya patil
Oct 24, 2009, 09:42 PM
prove that sin2x/1+cos2x=tanx

Unknown008
Oct 24, 2009, 11:34 PM
1. Convert your double angles into single angles.

Make use of:

sin2A = 2sinAcosA

cos2A = cos^2A - sin^2A = 2cos^2A-1 = 1-2sin^2A

You have to choose which one concerning the double angle for cos you want to use. The answer then comes by itself.

Give it a try now. :)