Chapter 2.4.3 Kcalc
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Kcalc is a scientific calculator application.

Features:

 - trignometric functions
 - factorials
 - built in mathematical and scientific constants.
 - memory
 - copy and paste

Useage
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To do simple arithmetic click the numbers and then press the sign for addition, multiplication, subtraction,  or division. You can also type in the numbers and press + for addition, - for subtraction, * for multiplication and / for division. To view the answer press the button that is an =.

Screenshot
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.. image:: Kcalc.png

Version
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Lubuntu ships with version 18.04.3 of Kcalc.

How to launch
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To launch kcalc go to accessories -> Kcalc or run kcalc from the command line.