If 3 sin^(2) alpha + 7 cos^(2) alpha = 4...

If `3 sin^(2) alpha + 7 cos^(2) alpha = 4`, then the value of `tan alpha` is (where `0 lt alpha lt 90^(@)` )

A

`sqrt(2)`

B

`sqrt(5)`

C

`sqrt(3)`

D

`sqrt(6)`

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