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MathGroup Archive 2000

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RE: Rookie question

  • To: mathgroup at
  • Subject: [mg23753] RE: [mg23658] Rookie question
  • From: "Higinio Ramos Calle" <higra at>
  • Date: Mon, 5 Jun 2000 01:09:48 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at

----- Original Message -----
From: Jose M Lasso <jml at>
To: mathgroup at
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
> 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

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