PhotoMath


PhotoMath, by MicroBlink Ltd., is a neat little utility available from the iOS App Store, and Android Play Store, that can make solving elementary Math homework less of a chore. Besides giving the answer outright, it provides a detailed step-by-step procedure for arriving at the answer.

Try it while the following equation is displayed on a second screen

2x^2+3=11

It does have its limitations though. An equation such as the following is currently unsolvable

\frac{1}{1-\frac{1}{1+\frac{1}{1-\frac{1}{x}}}}=3

Wolfram Alpha makes short work of that equation when you query it using its \LaTeX representation.

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History of file in Git repo


Who changed what, and when, in a file in a Git repo? The following simple command is usually enough

git log -p path