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

If `(1+tan alpha)(1+tan 4alpha)=2, alpha epsilon(0,(pi)/(6))`, then `alpha=`.

A

`(pi)/(20)`

B

`(pi)/(30)`

C

`(pi)/(40)`

D

`(pi)/(60)`

Text Solution

Verified by Experts

The correct Answer is:
A
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