Question: Let f(x, y) = x + sin y + x log y, calculate D(3)f(a; h), where a = (2, 1) and h = (x

Let f(x, y) = x + sin πy + x log y, calculate D(3)f(a; h), where a = (2, 1) and h = (x − 2, y − 1).

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