While you are typing:

**pi**is replaced by.`π`

**..t**is replaced by. Also see Syntax.`θ`

**inf**(**infinity**) is replaced by.`∞`

To graph **piecewise defined functions** or **piecewise defined parametric curves** type in each piece with the corresponding subinterval as a *single function* or *single parametric expression*.

The quickest way to type **dom=(0, 2π)** or **dom=(-∞, ∞)** is to delete the domain entirely, including **dom=**.

Note: Our **graphing software** allows you to use **numerical expressions**, such as **π** or **1+√(2)**, wherever you can use a literal number. This includes, for example, when specifying **coordinates** of a point, **domain end-points**, **axis labels**, or **angles**.

Remark: It's important to note that the values of **trigonometric** functions depend on the angle mode selected. As a result, the **graphs** of expressions containing trigonometric functions will (as expected) differ when changing from **RAD** mode (*default*) to other modes.