11/23 Notes

In class, we worked with trigonometry identities. When you have a trig equation, you want to first look to do algebra: factor, expand, or get a common denominator. Second, look for trig IDs to use. We learned definitions ie sec(x)=1/(cos(x)). We also looked at the pythagorean IDs: cos^2(x) + sin^2(x)=1, 1+tan^2(x)=sec^2(x), cot^2(x)+1=csc^2(x). We also studied complement IDs (ex. cos(x)=sin((pi/2)-x))and reflection IDs (ex. sin(x)=(pi-x)). We applied these IDs to simplify equations and expressions.