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(sinA + cosA)/(sinA-cosA)+(sinA - cosA)/(sinA+cosA)=2/(sin^2A-cos^2A)= 2/(2sin^2A-1)=2/(1-2cos^2A)
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(sinA + cosA)/(sinA-cosA)+(sinA - cosA)/(sinA+cosA)=2/(sin^2A-cos^2A)= 2/(2sin^2A-1)=2/(1-2cos^2A)
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