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At what points on the curve x^(2) + y^(2...

At what points on the curve `x^(2) + y^(2)-4y+1=0`, the tangents are parallel to the Y-axis?

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The correct Answer is:
(1,2) and (3,2)
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VMC MODULES ENGLISH-DIFFERENTIAL CALCULUS 2-JEE Advanced (Archive)
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