Closure Property of Addition ( Added: Mon Feb 14 2005   Hits: 77) Sum (or difference) of 2 real numbers equals a real number

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	Conic Sections ( Added: Mon Feb 14 2005   Hits: 87) By changing the angle and location of intersection, we can produce a circle, ellipse, parabola or hyperbola; or in the special case when the plane touches the vertex: a point, line or 2 intersecting lines.

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	Conic Sections ( Added: Mon Feb 21 2005   Hits: 79) For any of the above with a center at (j, k) instead of (0,0), replace each x term with (x-j) and each y term with (y-k) to get the desired equation.

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	Cosine: Definition ( Added: Mon Feb 21 2005   Hits: 91) Given any angle q (0 £ q £ 90°), we can find the cosine of that angle by constructing a right triangle with one vertex of angle q. The cosine is equal to the length of the side adjacent to q, divided by the length of the triangle's hypotenuse. In this way, we can find the cosine of any q in the range 0 £ q £ 90°.

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	Cosine: Derivative ( Added: Mon Feb 21 2005   Hits: 74) (cos(x)) = -sin(x)

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	Cosine: Expansions ( Added: Mon Feb 21 2005   Hits: 82) = 1 - (1/2!)x2 + (1/4!)x4 - (1/6!)x6

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