I still recall the day when my friend Yossi came to school and showed off his brand new graphing calculator. I was stunned by how easy it wa...
![Showing some love to math lovers](https://cdn-ak-scissors.b.st-hatena.com/image/square/6571391198fcb45e4d7c5cab7d90e5ca2fbf4605/height=288;version=1;width=512/http%3A%2F%2F2.bp.blogspot.com%2F-7bZ5EziliZQ%2FVynIS9F7OAI%2FAAAAAAAASQ0%2FBJFntXCAntstZe6hQuo5KTrhi5Dyz9yHgCK4B%2Fs1600%2Fgooglelogo_color_200x200.png)
I still recall the day when my friend Yossi came to school and showed off his brand new graphing calculator. I was stunned by how easy it wa...
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