*To*: mathgroup@smc.vnet.net*Subject*: [mg12021] Integrate lesson*From*: Ersek_Ted%PAX1A@mr.nawcad.navy.mil*Date*: Fri, 17 Apr 1998 03:40:56 -0400

User beware. If you want to use Integrate, DSolve, Solve, etc. on complicated expressions you should ensure the expressions are simplified. Consider the contrived case of Integrate below. Integrate makes no progress if the expression isn't simplified. However, (expr) can be simplified to (Sqrt[2] x) so the integral is just ( x^2/Sqrt[2] ). First I selected: - Cell - Default Output Format Type - InputForm __________________________ In[1]:= expr=Sqrt[2] x - (Sqrt[2]+Sqrt[3])x^x+Sqrt[5+2Sqrt[6]]x^x; In[2]:= Integrate[expr,x] Out[2]= Integrate[Sqrt[2] x - (Sqrt[2] + Sqrt[3])*x^x + Sqrt[5 + 2*Sqrt[6]]*x^x, x] In[3]:= FullSimplify[expr] Out[3]= Sqrt[2] x Ted Ersek