If (1+tanalpha)(1+tan4alpha)=2,alpha in ...

If `(1+tanalpha)(1+tan4alpha)=2,alpha in (0,pi/(16)),` then `alpha` is equal to

A

`(pi)/(20)`

B

`(pi)/(30)`

C

`(pi)/(40)`

D

`(pi)/(60)`

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The correct Answer is:

A

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