Need help figuring out how to utilize change of basis matrices in linear algebra? From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how use a change of basis matrix to get from one coordinate system to another.
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How To: Find the highest common factor (or HCF) of two numbers

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