Proof of (a+b)² revisited

All of us know what (a+b)² formula is, But sometimes even these most basic things have some neat ideas hidden inside them. This post explains the proof of (a+b)² from a geometric perspective(age old) and tries to appreciate its hidden beauty. To start with, lets take a square and divide its length/breadth into a units and call the remaining length b units as shown in the below figure. Now it is evident from the figure
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Windows Shell Tips and Tricks

Another tip for Windows power users. Most of us often use Run dialog to launch programs by hitting Win+R.
We can do a lot from this dialog, Today I would like to share a neat little trick that I found here. This trick helps us navigate to some common folder locations quickly. Inside run dialog type shell:system and hit enter to open c:\windows\system32 folder in explorer, similarly shell:downloads will open your default downloads folder.
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