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qdog
Posts:
12
Registered:
12/8/04
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Re: computer algebra, beginner needs help
Posted:
May 31, 2000 8:59 PM
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one way would be to use a computer algebra package like maple and graph
the two expressions and notice that they are equal, , however you need
to really know the Fundimental Trig. Identity that cos^2 + sin^2 = 1
and the Binomial Theorem, in this case (x+1)^2 = x^2 + 2x + 1
putting the two together gives you
x^2 + 2x + sin^2 = x^2 + 2x + 1 - cos^2 = (x+1)^2 - cos ^2
if you have a Mac with OS 8+, it comes standard with a graphing
calculator, use this first.
twma wrote:
> How do we know that two expressions are the same?
> For example, x^2+2x+sin^2x, (x+1)^2-cos^2x, are the same
> but where can I find algorithm to check them?
>
> I need BASIC references, web-sites
> in computer algebra for BEGINNERS.
>
> I did an internet-search but the result was not helpful.
> Perhaps, human intelligence is better.
>
> Thank you in advance.
>
> --
> ==================
> This article reflects my personal view only.
> twma@maths.uwa.edu.au
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