Unlike the JavaScript version of the CSS trigonometric functions, the CSS functions accept both angles and radians for the argument. Perhaps the nicest thing about having this functionality in CSS ...

but many fail to make the leap on how crucial circles are for trig functions. With static graphs and equations, it's possible to get a handle on the rules of what various functions do and mean.

Many students think they've solved a trig equation ... 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 ...