Khan Academy on a Stick

Equation of a tangent line

Finding the equation of the line tangent to f(x)=xe^x when x=1

Product and quotient rules

Derivatives of sin x, cos x, tan x, e^x and ln x
The product rule for derivatives
Product rule for more than two functions
Quotient rule from product rule
Quotient rule for derivative of tan x
Using the product rule and the chain rule
Product rule
Quotient rule and common derivatives
Equation of a tangent line

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This collection was created November 2014.