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If 0lt a lt b lt (pi)/(2) and f(a,b) =(...

If `0lt a lt b lt (pi)/(2) and f(a,b) =(tan b- tana)/(b-a)` then,

A

`f(a, b)le2`

B

`f(a, b)gt1`

C

`f(a, b) le1`

D

None of these

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