```
FullSimplify(expr)
```

works like

`Simplify`

but additionally tries some`FunctionExpand`

rule transformations to simplify`expr`

.

```
FullSimplify(expr, option1, option2, ...)
```

full simplifies

`expr`

with some additional options set

- Assumptions - use assumptions to simplify the expression
- ComplexFunction - use this function to determine the "weight" of an expression.

```
>> FullSimplify(Cos(n*ArcCos(x)) == ChebyshevT(n, x))
True
```

- ✅ - full supported

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