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

If `sectheta+tantheta=1`, then one root of the equation ` a(b-c)x^2+b(c-a)x+c(a-b)=0` is (A) `tantheta` (B) `sectheta` (C) `costheta` (D) `sintheta`

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