One Calculator key features:

● Scientific calculator, with calculation history and RPN mode
● Graphing calculator
● Unit converter
● Number base converter
● Matrix calculator
● Material Design and ease of use

One Calculator is suitable for solving easy common calculus and more complex mathematical calculations.

Detailed feature list:
● Basic Arithmetic
● Definite integrals
● Trigonometry (sin, cos, tan, arcsin, arccos, arctan)
● Complex numbers
● RPN calculations (Reverse Polish notation/postfix notation)
● Graphs for X,Y equations
● Measurement unit conversion
● Conversion between decimal, hexadecimal, octal and binary
● Matrix calculus
● Intreactive chronology of operations
● Specialized warning of errors
● Support for tablet and smartphone
● Themes

// Option A //

To download One Scientific Calculator mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download One Scientific Calculator mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download One Scientific Calculator from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search One Scientific Calculator in HappyMod App.