The Math and Trig functions are not the only math-related ... to click the fx button on the top left of the Excel worksheet. An Insert Function dialog box will appear. Inside the dialog box ...

Inside the dialog box, in the section Select a Category, select Math and Trigonometry from ... button on the top left of the Excel worksheet. An Insert Function dialog box will appear.

Interestingly enough, the trigonometric functions that define those relationships are also closely tied to circles. Needless to say, this makes trig one of the hardest topics in math for students ...