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Select the correct options from the given alternatives. If`sintheta=nsin(theta+2alpha)`then `tan(theta+alpha)`is equal to…..

A

`(frac(1+n)(2-n))tanalpha`

B

`(frac(1-n)(1+n))tanalpha`

C

`tanalpha`

D

`(frac(1+n)(1-n))tanalpha`

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