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Integration variables


Hi everybody, Mathematica gives us the possibility to use spherical coordinates (r,Ttheta,Pphi): I'm trying to write an integral in the polar angle Ttheta of the form:

Integral in [-1,1] Ttheta dCos(Ttheta)

where Ttheta is the polar angle and the integration variable is the cosine of Ttheta in the interval [-1,1].

I got the following error:

ntegrate::ivar: "Cos[Ttheta] is not a valid variable."

Does anyone knows the reason for that?

p.s: It happens with any system of coordinates, actually.


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