Basically, you define an equation, tell the graph what color to draw in, and CoreGraphics does the rest. I've been meaning to make something like this during precalculus and then during calculus 1, so ...

Many students think they've solved a trig equation when they get one answer (one size of angle \(x^\circ\)). However there's often more than one answer expected so be aware of this. Let's remind ...

Let's remind ourselves of what the sine graph looks like so that we can see how many solutions we should be expecting: Therefore, from the graph of the function, we can see that we should be expecting ...