In this video I show you how to simplify trigonometric identities by adding fractions. I begin this lesson by reminding you ...

In this video we will explore 24 different trigonometric expressions for to simplify. To simplify we will use algebraic ...

Sec(a-b) = cos(a+b) / cos^2a - sin^2b I'm trying to prove this, by turning the left side into the right. I am stuck. Presumably you have already done the sum and difference formulas for sin and cos.