## The Two Problems of the Calculus- Chapter 12

**1. The derivative, ** or "rate of change" or the slope of the
tangent to a curve, is used to describe how
quantities change. Historically, it helped deal with problems of how a
pendulum swings, how planets move in their orbits (as well as space
satellites), the velocity of a canon shell, light, electrons in a
wire, and blood flow, just to name a few applications.**2. The
integral, **which turns out to be just the inverse of the derivative,
historically dealt with the area under curves, the volume of fairly
regular shapes, the work done in moving objects and the energy in light
scattering, to name a few applications.

Both problems involve
infinite sequences and their limits. The derivative deals with an
infinite sequence of slopes of lines. The integral deals with an infinite
sequence of areas under a curve (which in turn involves an infinite series).

Archimedes (217-21 B.C.) essentially invented the integral calculus.
We'll start with this in Chapter 13 and find the area under curves
*different ways*.

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