Question

1.Найти неопределенные интегралы.
∫(x^2+ln(x^2))/x

Answer 1

$\int \frac{ {x}^{2} + ln( {x}^{2} ) }{x} dx = \frac{1}{2} \int \frac{t + ln(t) }{t}dt =\\ {x}^{2} = t, \: dx = \frac{1}{2x} dt \\ = \frac{1}{2} \int1dt + \frac{1}{2}\int\frac{ ln(t) }{t} dt = \frac{t}{2} + \frac{1}{2} \int \frac{ ln(t) }{t} dt = \\ ln(t) = u, \: dt = tdu \\ = \frac{t}{2} + \frac{1}{2} \int udu = \frac{t}{2} + \frac{ {u}^{2} }{4} = \frac{ {x}^{2} }{2} + ln^{2} (x) + C$