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 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 to solve an equation in which to rational expressions are said to equal each other.
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How To: Figure out the domain & range of a piecewise function

How To: Convert Fahrenheit to Celsius with a formula

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How To: Divide small numbers by big numbers

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How To: Evaluate factorials with a TI83 calculator

How To: Solve an equation with fractional powers

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