Question

măcar 2 3 integrale va rog

Answer 1

b)$\int\limits { \frac{arctgx}{1+ x^{2} } } \, dx = \int\limits{arctgxd(arctgx)} = \frac{arctg^2x}{2}+C$
d)$\int\limits{sin2xcosx} \, dx= \frac{1}{2} \int\limits {sin2x} \, d(sin2x)= \frac{sin^22x}{2}+C$