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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.

Mnemonic:
PEMDAS

Mnemonic:
"Please excuse my dear Aunt Sally"

Mnemonic:
BEDMAS: Brackets (parenthesis), Exponents, Division & Multiplication, Addition & Subtraction

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More mnemonics in this category

Definitions of sine, cosine and tangent

Sine = Opposite over Hypotenuse, Cosine = Adjacent over Hypotenuse, and Tangent = Opposite over Adjacent. SOH-CAH-TOA Some Old Horses Can Always Hear Their Owner Approaching

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."

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