# What conic section is an ellipse derived from?

Intersection of a cone and a plane such that the plane does not intersect with the base of the cone

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An ellipse is derived from the intersection of a plane and a cone.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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- How do you tell whether the graph opens up or down, find the vertex and the axis of symmetry of #y=(x-7)(x-1)#?
- How do you use the quadratic formula to solve #-2x^2+3x+4=1#?

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