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Questions on the use of numerical functions NIntegrate and NDSolve.

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This should work: Clear[f]; f[a_?NumericQ, b_?NumericQ] := NIntegrate[Sqrt[(Cos[t] - a)^2 + b^2], {t, 0, Pi}] and then add //N at the end of the definition of g[a,b] g[a_, b_] := Derivative[1, 0][ …
answered Sep 9 '15 by Nikolay Gromov