`ln(` is the natural logarithm, log base e (= 2.71828182845...).

`Web` has to do with graphing iterations of a function in Seq mode, and is admittedly of little use to programmers.

`Time` has a similar use to

`Web`, but it graphs sequences as series of points.

`Menu(` does take a stupid amount of storage, yes, but to be fair, making your own menu often takes more (not always, though!).

`Lbl` and

`Goto` are used to jump to places in the program.

`Lbl` marks points in the program with one or two character names (which can include 0-9, A-Z, and theta), and

`Goto` jumps directly to those points.

`GarbageCollect` is a command (usually triggered automatically) that clears up "garbage" data in the archive, which can build up if you archive and unarchive things often.

`sin(`,

`cos(`, and

`tan(` (as well as the many variants you will find in the catalog with 2ND+0) are trigonometric functions.

`cos(` represents an X value on the unit circle,

`sin(` represents a Y value on the unit circle, and

`tan(` is the

`sin(` value divided by the

`cos(` value (which can result in an error if

`cos(X)=0`!).

For future reference,

TI-BASIC Developer is a good resource for any information you need about a command.

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