Martin Rubey <[EMAIL PROTECTED]> writes:
> In[1]:= Integrate[ArcCos[Sin[2*z]]*Cos[z], {z,0,4*Pi/3}]
>
> Limit::ztest: Unable to decide whether numeric quantities
> -I/3 Pi I Sqrt[3] (-2 I)/3 Pi I Sqrt[3]
> {-E - --------- - E + -----------}
> I/3 Pi (2 I)/3 Pi
> E E
> are equal to zero. Assuming they are.
>
> Pi
> Out[1]= 1 - 2 Sqrt[2] - ---------
> 4 Sqrt[3]
>
> In[2]:= N[%]
>
> Out[2]= -2.28188
I should have added: Mathematica returns
Integrate[ArcCos[Sin[2*z]]*Cos[z], z]
2
Out[1]= -2 Cos[z] Sqrt[Cos[2 z] ] Sec[2 z] + ArcCos[Sin[2 z]] Sin[z]
Martin
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