Posted by **Trevor** on Tuesday, October 13, 2009 at 7:28pm.

Verify the following:

1. cos x/(1-sinx)= sec x + tan x

2. (tanx+1)^2=sec^2x + 2tan x

3. csc x = )cot x + tan x)/sec x

4. sin2x - cot x = -cotxcos2x

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