Need to know how to determine the equations of trigonmetric functions by inspecting their graphs? Learn how. Learn how to use trigonometric functions to calculate the sides of a right triangle. Need to know how to solve a matrixform linear equation in 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 to calculate the equations of trig functions by looking at their graphs.
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How To: Remember "greater than" & "less than" symbols

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

How To: Find the area of a triangle when given 2 sides & angle

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

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How To: Do long division without a calculator

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

How To: Find the slope of a line given 2 points with fractions

How To: Do normal probability calculations on a calculator

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How To: Convert improper fractions to mixed numbers quickly

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

How To: Apply the 4th Law of Exponents

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How To: Figure out the domain & range of a piecewise function

How To: Find the 100th term in a sequence

How To: Find density using the water displacement method
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