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New Member

1 Posts

Posted - 12/07/2010 :  16:44:15  Show Profile  Reply with Quote
1. (sin x + cos x)^2 - 1 = 2 sin x cos x

2. cos 4x= cos2x-sin2x

3. tan 2x= (2tan x)(1-tan x)

4. 1=2sinx+cos 2 x
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299 Posts

Posted - 12/07/2010 :  17:38:59  Show Profile  Reply with Quote
What are you trying to do and what have you done so far?
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