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: Do long division without a calculator

How To: Convert between diameter and radius

How To: Find the area & perimeter of triangles & squares

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How To: Find the opposite and absolute value of a number

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How To: Get decimal forms of rational numbers

How To: Increase a number by a percentage in basic arithmetic

How To: Calculate percent composition for chemistry

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How To: Find the area of an oblique triangle using formulas

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