# How to insert an equation with trigonometric functions

**Euler's formula**.

How to add an equation in your document, see Working with Microsoft Equation.

To insert, for example, the **Euler's formula**, do the following:

## In the **Professional** format:

** 1. ** In your own equation, under **Equation Tools**,
on the **Design** tab, in the **Structures** group, click the **Script** button:

In the **Script** list, choose **Superscript**:

** 2. ** In the base box of the script, enter ** e**.

** 3. ** At the bottom of the script, enter ** ix**.

** 4. ** Enter ** =**.

** 5. ** Under **Equation Tools**, on the **Design** tab,
in the **Structures** group, click the **Function** button:

In the **Function** list, choose **Cosine Function**:

** 6. ** In the base box of the trigonometrical function,
enter ** x**.

** 7. ** Enter ** +i**.

** 8. ** Under **Equation Tools**, on the **Design** tab,
in the **Structures** group, click the **Function** button and then in the **Function** list,
choose **Sine Function**:

** 9. ** In the base box of the trigonometrical function, enter
** x**:

## In the **Linear** format:

** 1. ** In your own equation, enter ** e^(ix)** and
then press the space bar.

When you press a space key, this linear formula transformed to the professional format:

** 2. ** Enter ** =**.

** 3. ** Enter ** cos** and then press the space bar:

** 4. ** Enter ** x** and then click the right arrow to
leave the base box of the

**Cosine function**.

** 5. ** Enter ** +i** and a space, then enter

**and a space again.**

*sin*Then you press the space key, the second part of your linear formula transformed to the professional format:

** 6. ** Enter ** x**:

See also how to create other types of equations.

See also this tip in French: Comment insérer une équation avec des fonctions trigonométriques.