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grad = Grad[x^2 - y^2, {x, y}]; VectorPlot[{grad[[2]], -grad[[1]]}, {x, -2, 2}, {y, -2, 2}] grad2 = Grad[Sin[x] Sin[y], {x, y}]; VectorPlot[{grad2[[2]], -grad2[[1]]}, {x, -2, 2}, {y, -2, 2}]



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