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\usepackage{amsmath, amssymb, graphics}

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\begin{document}

\noindent\(\pmb{f[x,y]=A*\sin (V*x)+B*(\cos (W*y))}\\
\pmb{\text{fsubx} = D[ f[x,y], x]}\\
\pmb{\text{fsuby}= D[ f[x,y], y]}\)

\noindent\(A \sin  V x+B \cos  W y\)

\noindent\(A \sin  V\)

\noindent\(B \cos  W\)

\end{document}