Why did the diff(y.laplace(t,s),x) come out to be D0(y(x, t), t, s)*D0(x, t)? Could someone help me?

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Why did the diff(y.laplace(t,s),x) come out to be `D[0](laplace)(y(x, t), t, s)*D[0](y)(x, t)`

? Could someone help me?

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