If sectheta=frac(5)(4), then frac(tanthe...

If `sectheta=frac(5)(4)`, then `frac(tantheta)(1+tan^2theta)` is equal to (A) `frac(9)(25)` (B) `frac(12)(25)` (C) `frac(3)(4)` (D) `frac(1)(25)`

A

D

B

C

A

D

C

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