Интеграл Dx / sqrt(X) (1+ sqrt (X))
dx | | 2t dt dt
∫--------------- = | замена:√x=t, x=t², dx=2t* dt | = ∫------------- =2∫ ------------ = 2 * ln|1+t|+C=
√x (1+√x) | | t (1+t) 1+t
=2 ln|1+√x|+C