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Show that the tangents to the curve y = ...

Show that the tangents to the curve `y = 7x^3 +11` at the points, where x=2 and x=- 2 are parallel.

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The correct Answer is:
`((dy)/(dx))_("("x_1,y_1")")=((dy)/(dx))_("("x_2,y_2")")`
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