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Let U(x,y) =e^(x) sin y, where x=st^(2),...

Let U(x,y) `=e^(x) sin y`, where `x=st^(2), y =s^(2) t, s, t in R`. Find `(del U)/(del S), (del U)/(del t)` and evaluate them at s=t=1.

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