Show that if the moment (overline{u^{n} v^{m}}), if it exists, can be found from the joint characteristic
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Show that if the moment \(\overline{u^{n} v^{m}}\), if it exists, can be found from the joint characteristic function \(\mathbf{M}\left(\omega_{U}, \omega_{V}\right)\) by the formula
\[ \overline{u^{n} v^{m}}=\left.\frac{1}{j^{n+m}} \frac{\partial^{n+m}}{\partial \omega_{U}^{n} \partial \omega_{V}^{m}} \mathbf{M}_{U V}\left(\omega_{U}, \omega_{V}\right)\right|_{\omega_{U}=\omega_{V}=0} \]
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