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If sec theta + tan theta=1, then root of...

If `sec theta + tan theta=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

`cot theta`

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The correct Answer is:
A
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