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The Fundamental Theorem of Calculus states the following Let be a continuous real valued function defined on a closed interval . Let be the function defined by Then is uniformly continuous on and differentiable on the open interval and is the antiderivative of or Conversely, Let be a real-valued function on a closed interval and a continuous function on which is an antiderivative of in If is Riemann integrable on then In simpler terms: The integral and the derivative are inverses of each other. 
Topics
Links
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Linear Algebra - for more on working with vectors. 
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MIT 18.02 Multivariable Calculus Fall 2007 - a good series of lectures that discuss multivariate differential and integral calculus.