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From: Mark McClure on 5 Feb 2010 03:32
On Thu, Feb 4, 2010 at 6:32 AM, K <kgspga(a)googlemail.com> wrote:
> faultyInt =
> Integrate[Cos[ph]*1/Pi*Cos[4*ph]*Cos[2*ph], {ph, Pi, 3/2*Pi}]
> gives as result:
> 19/(105 \[Pi])

Yes, I'd agree that's a bug. It does not occur in V6.0 or V5.2.
Also, if you pass the integrand to TrigExpand, you will find that you
get a version that V7 gets right - and, in fact, that a calculus
student could (in principle) do.

Mark McClure

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