Understanding what happens as we get infinitely close to a point.
Mastering the power, product, quotient, and the dreaded chain rule. paul's math notes calc 1
Derivative of the outside, keep the inside, times derivative of the inside. Understanding what happens as we get infinitely close
Unlike many texts that jump to ( \fracddx[f(g(x))] = f'(g(x)) \cdot g'(x) ), Paul gives the mnemonic: keep the inside