3dplot[sin[sqrt(x^2 + y^2) ]/sqrt(x^2+y^2), {x, -4pi, 4pi}, {y, -4pi, 4pi}]3dplot[sin[sqrt(x^2 + y^2) ]/sqrt(x^2+y^2), {x, -4pi, 4pi}, {y, -4pi, 4pi}]

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