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Which of the following identities, where...

Which of the following identities, wherever defined, hold(s) good? `(a)cotalpha-tanalpha=2cot2alpha` `(b)tan(45^0+alpha)-tan(45^0-alpha)=2cos e c2alpha` `(c)tan(45^0+alpha)+tan(45^0-alpha)=2sec2alpha` `(d)tanalpha+cotalpha=2tan2alpha`

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