Question: Derivatives in Maple

Hey, I need to answer this question, not sure where to start..Any help/tips would be much appreciated....

 

Bob wants to explore the effect of changes in a, b and c on the function h, where h(x, y) = ∂ 2 /∂x∂y (ay sin(bx + c)). How should Bob do this so that if he redefines the variables a, b, or c later in the Maple session, subsequently computed function values h(x) use the new values of a, b, c?

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