RE: Rookie question

*To*: mathgroup at smc.vnet.net*Subject*: [mg23753] RE: [mg23658] Rookie question*From*: "Higinio Ramos Calle" <higra at gugu.usal.es>*Date*: Mon, 5 Jun 2000 01:09:48 -0400 (EDT)*References*: <200005290309.XAA14632@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

----- Original Message ----- From: Jose M Lasso <jml at accessinter.net> To: mathgroup at smc.vnet.net Subject: [mg23753] [mg23658] Rookie question > Hi, > > Sorry for my ignorance, but I have Mathematica for just 3 days, and I have > a trouble, I try to calculate the following expression: > Integrate[1/(2(1-x^2)^(1/2)+(1-x^2)),{x,0,1}], but Mathematica dont give me > an answer, the program return the original input, do u have any ideas. Thx > in advance.Regards > > Jose M Lasso > > PS:Sorry for my english > You can use NIntegrate instead of Integrate when you have to deal with a difficult integral. But in this case it is possible to find the integral directly using a change of variable, setting x=Sin(t) the integral becomes Integrate[1/(2+Cos[t]),{t,0,Pi/2}] which is easy to obtain. Higinio Ramos