Acos function from Power Fx using Power Apps

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Power Fx is the low-code language that will be used across the Microsoft Power Platform. It's a general-purpose, strong-typed, declarative, and functional programming language.

The Acos function returns the arccosine, or inverse cosine, of its argument. The arccosine is the angle whose cosine is the argument. The returned angle is given in radians in the range 0 (zero) to π. The General syntax is Acos( Number ).

Reading this article, you can learn how to perform the Acos function from Power Fx using Microsoft Power Apps. Also, you will be able to learn Button control, Label control, and text input control in the Power Apps environment.

Step 1. Open the URL in the browser for Power apps.

Create an account with your Organisation Mail ID and log in, After logging into your Power Apps account.

Organisation Mail ID

Step 2. First, Click Create (+ ) and Select the Canvas app from blank.

Canvas app


Next, Give the App name as  PAPFACos and the Format as Tablet.


Now, In the Power Apps studio environment, Select the Create a Form option,

Power Apps studio environment

Step 3. To test the Power function, First Rename the Screen name as SCRPAD.

Power function

Next, Insert a Label control and set the Name and Text property as LblTitle and Acos function in canvas App using PowerFx with Power apps.

Label control

Next, Insert  a Label control and set the Name and Text property as LblNum and " Enter the Number."

Enter the Number

Insert a TextInput control and set the Name property as TxtNum and Format property as Number.


Insert  a Button control and set the Name property as BtnCal and Text property as Calculate and set OnSelect action as UpdateContext({RES:(TxtNum)}); for testing the Acos function in Power Fx.


Insert Label control and set the Name property as LblRes and Text property as "The arccosine  "& RES.Text &" radians is: " &Acos(RES.Text) for displaying Results.

Name property

Insert a Button control and set the Name property as BtnClr, Text property as Clear, and OnSelect  Property in Action as Reset(TxtNum); UpdateContext({LblRes:"}); for reset the Textboxes and Result.

 Button control

Finally, the form design looks like,

Form design

Step 4. Now we can see the preview of your App in Power Apps Studio, and The output of the PAPFACos is.


After clicking the Calculate Button,

The Browser Display is,

 Browser Display

The Apple iPhone Display is,

Apple iPhone Display

The Tablet Display is,

Tablet Display

After clicking the Clear Button,

Clear Button


Now, you have successfully tested the Power Fx – Acos inverse function in the Power Apps Studio environment. 

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