integració per parts

∫ [ f(x)·d_{x}[g(x)]·( mx^{(1+(-1)(1/m))} ) ] d[x^{(1/m)}] = ...
... f(x)·g(x)+(-1)·∫ [ g(x)·d_{x}[f(x)]·( mx^{(1+(-1)(1/m))} ) ] d[x^{(1/m)}]


∫ [ f(x)·d_{x^{(1/m)}}[g(x)] ] d[x^{(1/m)}] = ...
... f(x)·g(x)+(-1)·∫ [ g(x)·d_{x^{(1/m)}}[f(x)] ] d[x^{(1/m)}]