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How to plot multiple surfaces together in Wolfram|Alpha

Dear members of the group Could some one explain why the following line produces two surfaces in the same Plot in Mathematica, but the same line always produces two separated plot in Wolfram|Alpha?

Plot3D[{Sin[x y], Cos[x y]}, {x, -\[Pi], \[Pi]}, {y, -\[Pi], \[Pi]}]

Thanks in advance.

Jesus Rico

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