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Hallo, I test it in Mathcad 15 M045 and in Prime 3.1 too:
The Mupad engines handling of definite integrals is so poor it's comical, and this is just another example. You are often better off solving the indefinite integral and substituting the limits by hand:
Others likely have made similar comments.
Yours appears to be a very good example.
Edit: for clarity, the Mupad engine is what Mathcad uses for symbolic math.