Quotient rule

From Conservapedia

$\frac{d}{dx} \sin x=?\,$  This article/section deals with mathematical concepts appropriate for a student in late high school or early university.

The Quotient Rule is a rule in calculus pertaining to the derivative of a variable or function divided by another. It can be written as follows:

$\frac{d}{dx} \left(\frac{u}{v}\right) = \frac{v \left(\frac{du}{dx}\right) - u \left(\frac{dv}{dx}\right)}{v^2}$

Alternatively, in prime notation, it can be written as:

$\left(\frac{u}{v}\right)' = \frac{u'v - v'u}{v^2}$

It is easily remembered by the rhyme "Low 'D' High minus High 'D' Low, draw the line, and square below" (the denominator times the derivative of the numerator minus the numerator times the derivative of the denominator all over the denominator squared).
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