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blackpenredpen

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Solving x^5=1

They didn't get this integral right, so here's the solution (Berkeley Math Tournament Integral bee)

Solving x=sqrt(x-1/x)+sqrt(1-1/x) Math Stack Exchange

You probably haven't solved a quartic equation like this before!

Finding the BIGGEST rectangle under y=x^3 (but NO calculus!)

This equation looks werid

A proof for sin(a+b) and cos(a+b) that you probably haven’t seen before

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