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Oct 4th, 2015
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  1. syms r c Dbmix yb(r) delta r_sphere yb_bulk yb_surf
  2. D=diff(yb);
  3.  
  4.  
  5. dsolve(diff(r^2*2*c*Dbmix/(yb-2)*D)==0,yb(r_sphere)==yb_surf,yb(delta)==yb_bulk)
  6.  
  7. simp=simplify(ans)
  8.  
  9. pretty(simp)
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