### 5.18.1 The domain of a function: domain

The domain command takes one or two arguments. The first argument is an expression involving a single variable. If the variable is not x, the variable used should be the second argument.
domain returns the domain of the function defined by the expression.
Input:

domain(ln(x+1))

Output:

x>-1

Input:

domain(asin(2*t),t)

Output:

((t>=(-1/2)) and (t<=(1/2)))