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Questions on the use of numerical functions NIntegrate and NDSolve.
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Plotting values obtained using numerical integration
I have an integral which doesn't give a closed definite expression. The command
Integrate[x DiracDelta[r x - y] Exp[1/g^2 {Cos[x2 - x] + Cos[x2] + Cos[y+x2]}], {x, 0, 2 Pi}, {y, 0, 2 Pi}, {x2, -Pi, …