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Recently Referred Formulae

\int_0^{\infty}e^{-x^2}dx=\sqrt\pi
=\lim_{h\to0}{nx^{n-1}+?x^{n-2}h+...h^{n-1}}=nx^{n-1}
\frac{\sum_{k=0}^{n}{a_kx^k}}{\sum_{k=0}^{n}{b_kx^k}}
E[\bf{Z}_i]=\bf{\mu}\\
V[\bf{Z}_i]=\bf{\Sigma}
X - \bigcap_{\lambda \in \Lambda} = \bigcup_{\lambda \in \Lambda} (X - A_\lambda)