Precalc Problems Explained

Find out how to convert fractions of a degree with Degrees, minutes and seconds, and enter the wonderful world of the radian. I have a so...

Video at Archive.org Video at YouTube Solving for an unknown in the exponent requires logarithms! 19 Problems are explained that involv...

Matrix Determinant Video Use Cramer's Rule to solve a system of equations with Leinitz and Sarrus' method of finding the determi...

To solve for an unknown angle we will use all sorts of clever tricks, employing the trig formulas and identities in weird and wonderful ways...

Proof of the sum and difference formulas for sine, cosine and tangent

Using the trig identities for substituting a Pythagorean looking expression.

An Arithmetic Sequence is a pattern where each element changes by adding a constant. Here are examples, as well as the proof the formula fo...