I am checking my homework with mathematica, but sometimes when I write stuff like(adsbygoogle = window.adsbygoogle || []).push({});

D[(x/((x^2 - y^2)^0.5)), y] , which is supposed to give me the partial derivative of x/((x^2 - y^2)^0.5) with respect to y, i get answer like:

(1. x y)/(x^2 - y^2)^1.5

which is right, except for the random "1."

as another example, when I differentiate above function with respect to x, I again get an answer with "1.x^2" in a numerator.

what on earth is this "1." ?

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# Mathematica partial differentiation weirdness

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