∫ x√1 – x² dx.
u=1–x2 du=–2xdx xdx=–(1/2)du = ∫ √u·(–1/2)du=–(1/2) ∫ u1/2du=(–1/2)·u3/2/(3/2)+C= =(–1/3)·u√u+C= = (–1/3)·(1–x2)·√1–x2 + C