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Advanced Calculations

Let’s do some basic maths together. Please use your head first. Highlight the next two lines to see the respective answers.
What is the square root of four? It’s two, isn’t it?
And what do you get if you subtract two from two? Zero, right?
Now let’s do the above calculation using the Windows calculator. Type in 4, take the square root and from the result subtract 2. What do you get now?