If sectheta+ tantheta = 1, then root of...

If `sectheta+ tantheta = 1`, then root of the equation `(a-2b + c)x^2 +(b-2c+ a)x+(c-2a+b) = 0` is:

A

`sec theta`

B

`tan theta`

C

`sin theta`

D

`cos theta`

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The correct Answer is:

A, D

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