A site with step by step tutorials on how to draw and graph a variety of mathematical functions
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Analyze Math
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Online graphing calculator, useful for drawing out a function to visualize it or find key points.
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http://www.coolmath.com
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Shows 3-D diagram of the 4 types of conic sections. Explains how to use determinant to establish the type of section.
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Spark Notes
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A tutorial which includes a video and several examples for graphing ellipses and writing ellipses equations.
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Algebra Lab
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Step-by-step solutions to odd-numbered problems from dozens of precalculus textbooks.
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Hotmath
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A breakdown of all the major conic sections on one webpage with their general equations and graphs. It includes information on parabolas, circles, ellipses, and hyperbolas.
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James Jones' College Algebra Lecture Notes (Math 116)
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In this video, Salman Khan of Khan Academy explains conic sections and ellipses.
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Khan Academy
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Article on ellipses. Above the level of most students, but useful for the tutor.
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MathWorld
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A description of the axes of an ellipse and a formula for finding the length of the axes when given the foci.
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Math Open Reference
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