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 to write a formal analytical proof of the quadratic formula.
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How To: Use the sine, cosine & tangent trigonometric functions

How To: Find a number given Its percent

How To: Find the Percent Given Two Numbers

How To: Remember "greater than" & "less than" symbols

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Express a ratio as a fraction in simplest form

How To: Find the geometric mean

How To: Calculate Faster Than a Calculator

How To: Simplify complex fractions in algebra

How To: Write a slopeintercept equation given an XY table

How To: Find a missing side of a triangle, similar to another

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Divide small numbers by big numbers

How To: Find the area of a circle when you know the diameter

How To: Do long division with decimals

How To: Multiply & Divide Numbers (Basic Elementary Math)

How To: Prove a triangle inscribed in a circle is right angled

How To: Simplify a complex fraction w/ binomial denominators

How To: Work with linear, quadratic & exponential models

How To: Reduce fractions to their simplest form in basic math

How To: Use the sine, cosine & tangent trigonometric functions
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