Related rates problems give many calculus students headaches, but they don’t have to. Learn how to conquer these problems using implicit differentiation!

Learn how to solve optimization problems and find the extremes, the local or global minima or maxima of a function, in this lesson from integralCALC.

Don’t be intimidated by long implicit differentiation problems! Learn how to solve this type of equation with help from Krista, founder of IntegralCalc.

In this lesson from IntegralCalc, brush up on your calculus skills and work through a problem to find the equation of a line tangent to a particular function!

Understand derivatives with help from this lesson on difference quotients. See how to plug in values and functions and then simplify confusing equations.

Learn how to answer one of the most important questions in calculus by calculating the rate of change of a function at a point (aka taking the derivative)!

Take the confusion out of limits with integralCALC! Learn how to solve for limits and infinite limits, and what to do in the event of a point discontinuity.

You've got a graph, but how do you know whether or not it represents a function? Use the vertical line test! Learn the test, then practice on several examples.

Lost in the world of calculus? Start at the beginning by learning about functions - number ‘machines’ that serve as the basis for all of calculus.

Know your limits! Learn about the precise definition (or epsilon delta definition) of a limit, and how it can be used to prove that a limit is true.