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The slope of the tangent to a cruve y=f(...

The slope of the tangent to a cruve `y=f(x)` at `(x,f(x)0` is `2x+1`.If the curve passes through the point (1,2) then the area of the region bounded by the curve,the x-axis and the lien x=1 is

A

`5/6` sq. units

B

`6/5` sq.units

C

`1/6` sq. units

D

`6` sq. units

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