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Which os the following when simplified r...

Which os the following when simplified reduces to unity ? `(1-2sin^2alpha)/(2cot(pi/4+alpha)cos^2(pi/4-alpha))`

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Which os the following when simplified reduces to unity? (1-2sin^(2)alpha)/(2cot((pi)/(4)+alpha)cos^(2)((pi)/(4)-alpha))

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