If (1+ tan alpha)(1+ tan 4alpha)=2, alph...

If `(1+ tan alpha)(1+ tan 4alpha)=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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