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RE: Rookie question


----- 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




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