If alpha +beta = 90^@ and alpha:beta = 2...

If `alpha +beta = 90^@` and `alpha:beta = 2 : 1`, then `tanalpha : tanbeta` is equal to (A) `1 : 3` (B) `2 : 3` (c ) `3 : 2` (D) `3 : 1`

A

B

C

B

D

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