Dear members,
import sympy
import math
u = Function('u')
x = Symbol('x')
diff(diff(u(x),x),x) = D(u(x), x, x) ii is all right.
diff(x*diff(u(x),x),x) = x*D(u(x), x, x)+D(u(x), x) it is all right.
diff(sin(x)*diff(u(x),x),x) gives an error.
Can anyone show me the correct way to get a correct result ?
czbebe
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