Question: Error in intsolve


I have a problem with intsolve which seems does not cover nonlinear equations:

Please guide me.

my code is as follow:

intsolve(fracdiff(u(x, t), t, 1/2) = t^(1/2)*sin(x)/GAMMA(3/2), u(x, t));

But I face with the following error:

Error, (in intsolve) integral equation is not linear.

I searched but I did not find a solution or alternative code to this end.

Do you know the way?

The solution of equation shall be:


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