# Fundamental theorem of calculus

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So you've learned about indefinite integrals and you've learned about definite integrals. Have you wondered what's the connection between these two concepts? You will get all the answers right here. Beware, this is pretty mind-blowing.

Get comfortable with functions that for any input x, return the area under a curve between a given bound and x. This is an important stop on our journey to relating differential and integral calculus.

The fundamental theorem of calculus is definitely one of the most important theorems of all time! It relates differential calculus and the concept of the derivative with integral calculus and the concept of the integral. Learn all about it here!

Get better acquainted with the fundamental theorem of calculus, and apply it for a class of seemingly hairy problems.