Integration, series and curves in motion.
The toolkit for antiderivatives that substitution alone can't crack: parts, trig integrals, trig substitution, partial fractions, and what to do when no formula exists.
Slice, approximate, add up: the same idea measures the length of a curve, the skin of a solid, a balance point, the push of water on a dam, and probabilities.
New ways to describe curves: as a moving point (parametric) or by distance and angle (polar), and how to do calculus on them.
Infinite lists and infinite sums: when they settle on a value, the tests that tell you, and how to estimate a sum you can't compute exactly.
Polynomials that never end: where they converge, how to build them from functions you know, and how they compute integrals, limits and approximations.

Definite integrals as accumulation

Trig substitution

Integrals involving roots

Approximating definite integrals

Surface area of revolution

Hydrostatic pressure and force

Area and arc length with parametric equations

Series and geometric series

The divergence test and the harmonic series

Absolute and conditional convergence

The binomial series

Infinite series of sines

Integrals involving quadratics

Polar coordinates and tangents

Area with polar coordinates

The comparison test for series

Power series as functions