$\int\left(\frac{x^2}{x^2-2x-3}\right)dx$

$1x^2-kx+121$

$\int\frac{x^{3.5}-4x^{1.5}-x^{0.5}}{x^{1.5}}dx$

$-\left(\frac{-49}{7}\right)^{2}$

$\int\left(8y+y^2\right)^{10}dy$

$0,6+0,6$

$\lim_{x\to2}\left(\frac{\sqrt[2]{x^2+5}-3}{x^4-x^3-2x-4}\right)$