# Browse Classroom Capsules and Notes

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Displaying 201 - 210 of 1214

A proof of the formula

An alternative way of finding the equation of the circle.

Using Geometry to find the proof.
The author uses combinatorics to find the number of rankings of tennis players that are consistent with the tree representing a given tournament.

Example to clarify concept of alternating series.

A different way to find the product rule

Use the double angle formula for the tangent to construct Pythagorean triples.

The author characterizes and counts the number of the many row-reduced echelon forms associated with the set of all $$m \times n$$ matrices.

A different way to find a usual limit

Use trigonometry inequality to show a geometric fact.