Angle Sum Formulas III: Tangent, Cotangent, Cosecant, and Secant

In this third installment, I demonstrate the angle-sum--and then in particular, the double-angle--formulas for tangent and cotangent, as well as the cumbersome angle-sum formulas for cosecant and secant.

I made this video before I left for vacation in July, and had gotten sidetracked by my video response to Dr. Peyam about product calculus, and left this unedited. Anyway, here it is!

If you have any questions, leave a comment down below or feel free to email me at the incorrectly spelled whatthehectagon@gmail.com!

Time Stamps:
0:00 Introduction
2:15 Tangent Angle-Sum Formula
5:30 Cotangent Angle-Sum Formula
8:15 Tangent and Cotangent Double-Angle Formulas
9:20 Cosecant Angle-Sum Formula
12:30 Secant Angle-Sum Formula

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