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03/29/10 5:32pm

When I leave r as a variable, Solve provides an answer in terms of variable r, but if I set r=3 I get no answer; or if I try r==3 the value for r doesn't fill it and leaves the answer in terms of variable r?? what am I doing wrong here??

f[t_]=v==4/3 \[Pi] r^3;Dt[v,t]=-2;v=v;r=r;

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