Re: [MATHEDCC] Re: [MATHEDU] Proofs

Phil Mahler (mahlerp@admin.middlesex.cc.ma.us)
Sat, 07 Mar 1998 08:21:55 EST5EDT4,M4.1.0,M10.5.0

>I have encountered a few integrals that the TI-92 has a little trouble
>with, apparently. For example, the integral of sin(ln(x)). It's a very
>easy integral to perform by hand (by parts, twice). Does anyone know why
>this is troubling for the TI-92? It appears in Shenk's text (1977,
>Goodyear,p.376)

Interesting - thanks for the example of a textbook expression for which
the TI-92 will not find the antiderivative.

FYI, Maple handles it:
¥ int(sin(ln(x)),x);
1/2 x (sin(ln(x)) - cos(ln(x)))

Theorist does not. Perhaps their renamed version, Mathview does.

Phil Mahler
Middlesex CC
Bedford, MA
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