Sunday, June 2, 2013

prove: (cosx-secx)^2=tan^2(x)-sin^2(x)

 

which we rewrite as 

%0D%0A%28sec%5E2%28x%29-1%29%2B%28cos%5E2%28x%29-1%29=tan%5E2%28x%29-sin%5E2%28x%29%0D%0A
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