AP Calculus BC / Unit 6: Integration and Accumulation of Change
6.7 The Fundamental Theorem of Calculus and Definite Integrals
Notes
If $F'=f$, then $$\int_a^b f(x)\,dx=F(b)-F(a)$$
- Also: $\displaystyle f(b)=f(a)+\int_a^b f'(x)\,dx$ (net change).
Practice
$\displaystyle \int_1^3 2x\,dx=$
$x^2$ from 1 to 3: $9-1$.
$f(2)=5$ and $\displaystyle \int_2^6 f'(x)dx=7$. Find $f(6)$.
Net change: $5+7$.
$\displaystyle \int_0^{\pi}\sin x\,dx=$
$-\cos\pi+\cos0=2$.
Ready for more? Take the Unit 6 test.