\(\text{Mengelilingi sumbu y, maka}\\
V = \pi \int _a ^b [f(y)]^2 dy\\
\text{Diantara dua kurva, maka}\\
V = \pi \int _a ^b [f(x)]^2 - [g(x)]^2 dx\\
V = \pi \int _a ^b [f(y)]^2 - [g(y)]^2 dy
\)
\(\int u.v ^n dx = \frac{u}{v(n+1)}v^{n+1}+c\\
\int u \sin v dx = - \frac{u}{v}\cos x + c \\
\)