Скачать или смотреть Shortcut to hard question!

Thanks to Raihan for the suggestion! This is from the 2015 University of Indonesia (one of the best universities in Indonesia) entrance exam.

Difference of squares visual proof
   • Visual math proof x² - y² = (x + y)(x - y)  

Difference/sum of cubes visual proof
   • Visual explanation of the sum of cubes for...  

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