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Ellipse tangent line

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Given the ellipse

x2/4 + y2/9 = 1

What are the points where the tangent line is vertical?

(In narrative, the problem reads: given the ellipse x squared divided by 4, plus y squared divided by 9, equals 1, what are the points where the tangent line is vertical? The problem is also attached in MS Word, in case you need it.)

Solution Summary

This shows how to find vertical tangent line to an ellipse.

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