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  4. The gradient of the tangent line at the point (a cos α, a sin α) to the circle x2+y2=a2, is -

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Q. The gradient of the tangent line at the point $(a \cos \alpha, a \sin \alpha)$ to the circle $x^2+y^2=a^2$, is -

Conic Sections

Solution:

Correct answer is (d) $-\cot \alpha$