Question: Elasticity maple ?what ?!

ok back again ! can maple do elasticity ? and cross elasticity let say I have,like the other example I use all the time. d(pc,pt)=2000+1000pt-2Pc and s(pc)=23pc now how can I do the cross- elasticity?(or do I just say the elasticity) of d(pt,pc) against pt. knowing that pt=4 and that pc=2. thank you very much ! peace ! p.s. : if you need more info please do tell.
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