$$
f(x) = \int_{-\infty}^\infty
f(\hat\xi\,)e^{2 \pi i \xi x}
\,d\xi
$$
\( x = {-b \pm \sqrt{b^2-4ac} \over 2a} \)
$$
\int_{0}^{1} f(x) \ dx
= \lim_{n \to \infty} \dfrac{1}{n} \sum_{k=0}^{n-1} f \left (\dfrac{k}{n} \right)
$$
KaTeXの試し
2022/10/18 22:57:00