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Question: Answered & Verified by Expert
A point on the curve $x=3 \cos \theta, y=2 \sin \theta$ at which the tangent is perpendicular to $X$-axis is
MathematicsApplication of DerivativesAP EAMCETAP EAMCET 2020 (22 Sep Shift 1)
Options:
  • A $(3,0)$
  • B $(0,3)$
  • C $(0,-3)$
  • D $(-3,3)$
Solution:
1726 Upvotes Verified Answer
The correct answer is: $(3,0)$
Given curve is $x=3 \cos \theta, y=2 \sin \theta$ is represent ellipse, $\frac{x^2}{9}+\frac{y^2}{4}=1$ and the tangent perpendicular to $X$-axis can be drawn at end points of the major axis means either at $(3,0)$ or $(-3,0)$.

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