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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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Which of the following identities,wherever defined,hold(s) good? (a) cot alpha-tan alpha=2cot2 alpha(b)tan(45^(@)+alpha)-tan(45^(@)-alpha)=2cos ec2 alpha(c)tan(45^(@)+alpha)+tan(45^(0)-alpha)=2sec2 alpha(d)tan alpha+cot alpha=2tan2 alpha

(tan(45^(@)+alpha)-tan(45^(@)-alpha))/(cot(45^(@)+alpha)-cot(45^(@)-alpha))=

tan2alpha-tanalpha(1+sec2alpha)=

tan alpha+2tan2 alpha+4tan4 alpha+8cot8 alpha=cot alpha

1/(tan3alpha-tanalpha)-1/(cot3alpha-cotalpha)=cot2alpha

(tan (45^(@) + alpha ) + tan ( 45^(@) - alpha ))/( cot (45^(@) + alpha ) + cot ( 45^(@) - alpha ))=

tanalpha+2tan2alpha+4tan4alpha+8cot8alpha=?

tan alpha + 2 tan 2alpha + 4 tan 4 alpha + 8 cot 8 alpha =

tan alpha + 2 tan 2alpha + 4 tan 4 alpha + 8 cot 8 alpha =

Prove that: t a nalpha+2tan2alpha+4tan4alpha+8cot8alpha=cotalpha