AP Calculus BCmediummcq1 pt
A parametric curve's tangent is horizontal where
A.dy/dt = 0 and dx/dt ≠ 0
B.dx/dt = 0
C.dy/dx = 0 always
D.both rates are zero
Explanation
Core Concept
Horizontal tangents need zero y-rate with nonzero x-rate.
Correct Answer
Ady/dt = 0 and dx/dt ≠ 0
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