zhangrf

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Member for: 4 years, 108 days

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Answered: zhangrf 10

March 12 2021

0 0

if u=u(x) is ok,

but u=u(x,y) Maple can't work.

restart;

alias(u = u(x));

int(diff(u, x)*diff(u, x) + diff(u, x, x)*u, x);

restart;

alias(u = u(x, y));

int(diff(u, x)*diff(u, x) + diff(u, x, x)*u, x);

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