用MMA替换微分表达式中的函数

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青青子衿 Posted at 2021-7-23 23:30:34 |Read mode

Last edited by 青青子衿 at 2024-11-24 16:19:00y''[x] - y'[x]^2 + 2 y[x] /. y -> (Cos[#] &)
x*y''[x] + 2 y'[x] + t^2 x*y[x] /. y -> (Sin[t*#]/ # &) // Factor
D[f[x, y], x, y] /. f -> (#2*Cos[#1] + Sin[#1] &) //Simplify // ExpandAll

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