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A tangent is drawn to the curve y=8x^2 a...

A tangent is drawn to the curve `y=8x^2` at a point `A(x_1, y_1),w h e r ex_1=2.` The tangent cuts the x-axis at the point`Bdot` Then the scalar product of the vectors ` vec A Ba n d vec O B` is: `3` b. `-3` c. `6` d. `-6`

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