Quick Recap — Definite Integrals

  • Fundamental theorem: abf(x)dx=F(b)F(a)\displaystyle\int_a^b f(x)\,dx=F(b)-F(a) where F=fF'=f.
  • aaf=0\displaystyle\int_a^a f=0 and abf=baf\displaystyle\int_a^b f=-\int_b^a f.
  • Symmetry: aa(odd)=0\displaystyle\int_{-a}^{a}(\text{odd})=0 and aa(even)=20a\displaystyle\int_{-a}^{a}(\text{even})=2\int_0^a.
  • Definite integral gives net signed area.