Question: how to get the Chain rule automatic in maple


Hi, see above image, how do I get maple to do the chain rule automatically, for example, if I simply put in the alias V(h), instead of V(h(x)), this last command generates zero. 


Also, what is D(V)(h) ? is this equivalent to dV/dh, and if so how would I get maple to present it in this form?


Many thanks for your help ! 

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