"Error, (in dsolve/numeric/BVPSolve) matrix is singular" it's probaly means No solution or  infinitely many
solutions.

No_solution.mw

Almost the same Question here.

@vv 

The question concerned to integral : Int(cos(2*x)/(1+2*sin(3*x)^2), x = 0 .. Pi) not for Int(cos(2*x)/(1+2*sin(3*x)^2), x = 0 .. Pi/2) ? My answer is correct and Maple  returns 0.

J := Int(convert(cos(2*x)/(1+2*sin(3*x)^2), exp), x = 0 .. Pi); evalf(J) = evalf(value(J));

# 2.065847493*10^(-13) = 0.

@Preben Alsholm 

I do not care what the method Maple uses. In this example,Zero is the correct answer.

@nm 

sol := pdsolve([pde, ic], w(x, t)) assuming t>0,x>0;

#sol := w(x, t) = f(-3*t^2*(1/2)+x)*exp(-t)

With no error massages:

sol := pdsolve([pde, ic], w(x, t), HINT = `*`);

#sol := w(x, t) = exp(t)*invfourier(fourier(f(x), x, s)*exp(-(1/2)*(3*I)*t^2*s), s, x)

@ecterrab 

Thanks for information.

@ecterrab 

Thanks for quick fix.

@ecterrab 

With Physics package version 194 I have an error?

error.mw

@digerdiga 

I do not know if this is intended action.Maybe KroneckerDelta function in Physics is different than in math.

@vv 

This should be something like this?

about(_Z9);

#Originally _Z9, renamed _Z9~:
  is assumed to be: AndProp(integer,RealRange(0,0))

@Christopher2222

Update intsolve to solve linear and non-linear integro-differential , systems and integral equation,systems for symbolic and numeric.

@Christopher2222

Update pdsolve ,numeric to solve partial differential equations for three,four(and more) independent variables.

And solve elliptic PDEs. It's been seven years now and Maple is still standing still.

Very briefly: Maple dosen't know the answer.

More info in Documentation:

?DESol

@Rouben Rostamian  

Mathematica better handle multidimensional integrals numerically than Maple :)

Harder  example:

Int(exp(-b^4-c^4-a^3), [a = b^2/(4*c) .. infinity, c = 0 .. infinity, b = -infinity .. infinity]);

#?

My workaround dosen't work very fast now, Maple calculations never ending.

MMA solve with about 2.88451 second.