Toronto Math Forum
APM346-2016F => APM346--Tests => Q1 => Topic started by: Victor Ivrii on September 29, 2016, 09:29:38 PM
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Find the general solutions to the following equation:
\begin{equation}
u_{xyz}=\sin (x)+\sin (y)+\sin(z)
\label{eq-1}
\end{equation}
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$ u_{xyz} = \sin x + \sin y + \sin z $
$ u_{yz} = - \cos x + x \sin y + x \sin z + f_{yz}(y,z) $
$ u_{z} = - y \cos x - x \cos y + xy \sin z + f_z(y,z) + g_z(x,z) $
$ u = - yz \cos x - xz \cos y - xy \cos z + f(y,z) + g(x,z) + h(x,y)$