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tan(45+a) tan(45-a)=1

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tan(45+a) tan(45-a)=1
Prove that (tan(45+A) - tan(45-A)) / (tan(45+A) + tan(45-A)) = sin2A
Prove : tan(45+a) - tan(45-a) = 2tan2a
Prove that : tan(45+A) + tan(45-A) = 2sec2A
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tan(45+A/2)=root(1+sina)/(1-sina)
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