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How to calculate the partial derivative?
Posted:
Nov 21, 2012 1:15 AM


Dear all,
I am trying to calculate the partial derivative by mathematica, I have the following commands: L1=a1+b1*x+c1*y; L2=a2+b2*x+c2*y; L3=a3+b3*x+c3*y;
NN=L1*L2;
DNx=D[NN,x];
I got the following result: DNex=b2 (a1+b1 x+c1 y)+b1 (a2+b2 x+c2 y)
How to do to have the following result?
DNex=b2*L1 + b1 * L2
Thanks, Tang Laoya



