How to Use Trig Functions in Excel. Excel has built-in functions for sine and cosine, ... Click in cell B2 to enter the formula for converting the degrees in A2 to radians.

Part of that is the way it's taught. Students are taught the "unit circle" and its relationship to trigonometry, but many fail to make the leap on how crucial circles are for trig functions.

Before functions, to get an average, you would add a column of numbers; for example 10 numbers; then divide by that total (10). The AVERAGE function does that for you. So typing =AVERAGE(E2:E6 ...