Question: Minimising a function of three variables

I have a function which comprises a number of sub functions or procedures. E:= (r01,r12,r02) -> VrepR(r01,b01) + VrepR(r12,b12) + VrepR(r02,b02) + VattR(r12,b12)+Vbend(r02); > VrepR := proc(r,b): > rc:= evalf(b*2^(1/6)); if (r
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