Answer
$${\frac {\partial w}{\partial x}}={\frac {\partial w}{\partial r}}*{\frac {\partial r}{\partial x}}+{\frac {\partial w}{\partial s}}*{\frac {\partial s}{\partial x}}+{\frac {\partial w}{\partial t}}*{\frac {\partial t}{\partial x}}$$
$${\frac {\partial w}{\partial y}}={\frac {\partial w}{\partial r}}*{\frac {\partial r}{\partial y}}+{\frac {\partial w}{\partial s}}*{\frac {\partial s}{\partial y}}+{\frac {\partial w}{\partial t}}*{\frac {\partial t}{\partial y}}$$
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