Trigonometry Resources

I'm going to list what I believe are the key concepts that you need to master across different math subjects. These are the tools that I have to use most often in order to solve problems, so you should get very familiar with the theory behind them and very comfortable with applying them.   Algebra 1: order of operation (PEMDAS) solving equations slope-intercept form of... read more

My first year in college (a very long time ago...!), I came home for the Thanksgiving Holiday and learned that my younger brother, Chip, was struggling with Trigonometry.  Chip was pretty smart, so I was a bit puzzled as to why he would be having trouble.   I sat down with him, and within about 15 minutes I discovered that he had missed one key concept early in the school year,... read more

The Law of Cosines Written by tutor Jeffery D. In this article we will prove the Law of Cosines and explain how it can be used to determine side lengths and angles of triangles in two particular cases. The Law of Cosines can be used to "solve" triangles in two particular situations. Recall that to "solve" triangles means to determine unknown side lengths or angle... read more

The majority of the students that I have often have the same problem -- they aren't grasping the information fast enough or they aren't really able to follow the lessons a teacher gives.   Sometimes, teachers aren't adaptive to every learning style for each student in their classroom.  However, know that each student has the capability to learn math on their own.  It is... read more

Using Euler's Formulas to Obtain Trigonometric Identities Written by tutor Jeffery D. In this lesson we will explore the derivation of several trigonometric identities, namely cos (x + y) = cos x cos y - sin x sin y and sin (x + y) = sin x cos y + sin x cos y also cos 2x = cos2 x - sin2 x along with sin 2x = 2 sin x cos x and lastly, DeMoivre's... read more