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10/25/11 02:39am

Can anyone please help me to understand why I obtain this error and how it can be overcome please?

Much appreciated!


Integrate[(1 - cos (m*x + n*y))/(4 - 2*cos (y)*(cos (y) + cos (x))), {x}, {y}]

Integrate::ilim: Invalid integration variable or limit(s) in {x}.

Integrate[(1 - cos (m x + n y))/(4 - 2 cos y (cos x + cos y)), {x}, {y}]

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