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Let C be the curve y=x^3 (where x takes ...

Let `C` be the curve `y=x^3` (where `x` takes all real values). The tangent at `A` meets the curve again at `Bdot` If the gradient at `B` is `K` times the gradient at `A ,` then `K` is equal to 4 (b) 2 (c) `-2` (d) `1/4`

A

`4`

B

2

C

`-2`

D

`(1)/(4)`

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