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Re: Simple equation checking..
*To*: mathgroup at smc.vnet.net
*Subject*: [mg25665] Re: Simple equation checking..
*From*: "Bill Bertram" <wkb at ansto.gov.au>
*Date*: Wed, 18 Oct 2000 02:52:34 -0400 (EDT)
*Organization*: Australian Nuclear Science and Technology Organisation
*References*: <8seb1e$6tb@smc.vnet.net>
*Sender*: owner-wri-mathgroup at wolfram.com
Ian Fan <ian at v-wave.com> wrote in message news:8seb1e$6tb at smc.vnet.net...
>
> Hi again, thanks for all the help with my last question but now I am stuck
> with another problem if anyone would be so kind enough to help.
>
> I am looking for a way to check equations, for example, the derivative of
> ((x^3 - 4x + 3)/x^(4/3) is (5x^(10/3) - 8x^(7/3) - 12x^(1/3))/(3x^(8/3))
> when calculated via hand but is (3x^2 - 4)/x^(4/3) - 4(x^3 - 4x +
> 3)/(3x^(7/3)) when put through mathematica.
Simply use the A == B statement to check for true or false! For your example
Mathematica will only return a true/false result if the statement is
actually true for all values of x. If the statement is not true in general
it may well be true for certain values of x so Mathematica does cannot give
the result "false".
> What I would like to do is if
> there is any way to equate the two and see if the statement is true
because
> obviously it can look like two completely different answers (to a student)
> when they are in fact the same.
...but the two expressions you have given above, are not the same! Try
evaluating them with x=1.
> Another example would be, is there any way to check if E^(:ii:Pi) = -1
was
> true (at least according to the Euler-Moivre equation), using Mathematica?
Yes,
E^(:ii:Pi) == -1
gives the result "true"
Cheers,
Bill
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