A conic section is the intersection of a plane and a cone. 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. parabola, 2 parallel lines, 1 line or no curve.

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I introduce how to evaluate trig functions without knowing the actual angle measures. With just enough information to determine what quadrant an angle is in and set up the reference triangle, we can find any trigonometric ratio. Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each…

In this video, I show how to find a partial fraction decomposition for a given rational function.