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If angle C of a triangle ABC be obtuse, then (A) `0 < tan A tan B < 1` (B) `tan A tan B > 1` (C) `tan A tan B=1` (D) none of these

A

`0 lt tan A tan B lt 1`

B

`tan A tan B gt 1`

C

`tan A tan B =1`

D

none of these

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