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Definitions of sine, cosine and tangent
Sine = Opposite over Hypotenuse, Cosine = Adjacent over Hypotenuse, and Tangent = Opposite over Adjacent.

 Mnemonic:
SOH-CAH-TOA

 Mnemonic:
Some Old Horses Can Always Hear Their Owner Approaching

 Mnemonic:
Some Old Horse Came A-Hoppin' Through Our Alley

 Mnemonic:
Silly Old Henry Can't Add Hundreds, Tens Or Anything

 Mnemonic:
Some Old Hags Can't Always Hide Their Old Age

 Mnemonic:
Some Old Hippie Caught Another Hippie Tripping On Acid

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More mnemonics in this category

Order of operations
Parenthesis, Exponents, Multiplication & Division, Addition & Subtraction. In order from left to right. Multiplication then division which ever one comes first then, addition and subtraction which ever one comes first. PEMDAS "Please excuse my dear Aunt Sally"
Order of taking the derivative of a quotient
(high/low)' = (low * high' - high * low')/low2 "lo-di-hi minus hi-di-lo all over lo squared", lo = low, hi = high, di = derivative "Low d high, Less high d low, Draw the line, O'er squared be low."
Pi (π)
3,14159... An excellent rational approximation of π is obtained by noting that 1 / π ≈ 1 1 3 / 3 5 5 .
Trigonometric functions
Trigonometric functions that are positive in each quadrant, beginning with the top right and continuing counterclockwise: All, sine, tangent, cosine All Students Take Calculus
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