$\int\frac{x^2+19x+10}{2x^2+5x}dx$
$b+b^2-4b+b^2+3b$
$-x^2+6x+1$
$-\frac{5}{39}sin5xcos8x+\frac{8}{39}sin8xcos5x$
$0,09x^2-0,54xy+0,81y^2$
$\left(y^2+2xy+1\right)dx+\left(2xy+x^2\right)dy=0$
$x^2+18x+5=0$
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