# ACT Math : How to find the domain of the tangent

## Example Questions

### Example Question #1 : How To Find The Domain Of The Tangent

What is domain of the function  from the interval ?

Explanation:

Rewrite the tangent function in terms of cosine and sine.

Since the denominator cannot be zero, evaluate all values of theta where  on the interval .

These values of theta are asymptotes and will not exist on the tangent curve. They will not be included in the domain and parentheses will be used in the interval notation.

The correct solution is .

### Example Question #2 : How To Find The Domain Of The Tangent

Where does the domain NOT exist for ?

Explanation:

The domain for the parent function of tangent does not exist for:

The amplitude and the vertical shift will not affect the domain or the period of the graph.

The tells us that the graph will shift right  units.

Therefore, the asymptotes will be located at:

The locations of the asymptotes are:

### Example Question #3 : How To Find The Domain Of The Tangent

Find the domain of .  Assume  is for all real numbers.