Need help proving the sin(a+b)=(cos a)(sin b)+(sin a)(cos b) trigonometric identity? This free video lesson will show you how. 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 verify this fundamental trigonometric identity.
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How To: Divide small numbers by big numbers

How To: Convert between diameter and radius

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

How To: Find the 100th term in a sequence

How To: Find the Slope Given 2 Ordered Pairs

How To: Divide decimals

How To: Solve a line integral over a closed path

How To: Use cross products to solve proportions

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

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How To: Factor a trinomial with negative leading coefficient

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