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Find the points at which the tangent to ...

Find the points at which the tangent to the curve `y = x^(3) - 3x^(2) - 9x + 7` is parallel to the x-axis.

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The correct Answer is:
The points required are `(3, -20), (-1, 12)`.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-APPLICATION OF DERIVATIVES-Exercise-10(b)
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