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12-97.
  1. For the parametric curve with equations x(t) = 2t3 − 15t2 + 24t + 7 and y(t) = t2 +t +1, find all values of t at which the curve has a tangent line that is: Homework Help ✎

    1. Horizontal

    2. Vertical

If the tangent line is horizontal, the dy = 0.
If the tangent line is vertical, then dx = 0.