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If the curve y=x^(2)+bx +c touches the ...

If the curve `y=x^(2)+bx +c ` touches the line y = x at the point (1,1), then the set of values of x for which the curve has a negative gradient is

A

`xlt1/2`

B

`xgt1/2`

C

`xlt-1/2`

D

`xgt-1/2`

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The correct Answer is:
A
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