**TI92P*mainiemMultivariable Total Derivative RdtsZFunc:Return (when(part(part(e,i))0,(eu,part(part(e,i),1))*(expr(string(part(part(e,i),2))),dv),(eu,part(e,i))*(part(e,i),dv)),i,1,dim(e))R7𱱊;ltR:leudvŏeudv ŏ𱱊˺dt(ok,{ok},ERROR)-dt(e,{x=,},v|v')-R dvdv+'-dv9,VAR-dv ;}dt(eu,ep{x=,},v['])e Multivariable Total Derivative v1.0 eu: Continuous function ep: {Independant function's} v: Independant variable v': Substitute partial () in soln e: Total derivative Ex: dt(x^2-x*y+y^2,{x=1+t^2,y=1-t^2},t') Ex: dt(x^2+x*y,{x,y=x^2},x) Frank P. Westlake -dveu0