# 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* presentation:

** 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 script enter ** e**.

** 3. ** In 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* presentation:

** 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 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, second part of your linear formula transformed to the professional format:

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

See also how to create other types of equations.