$-4ab^2-6ab^2$

$\lim_{x\to\infty}\left(\left(\frac{n+1}{n-5}\right)^{6n-2}\right)$

$\int_0^ycos\left(xy\right)^2dx$

$\int\frac{4}{x\sqrt{x^2+4}}dx$

$12-4\left(y-3\right)=24+4y$

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

$\left(\frac{3}{2}x^2-1\right)\left(\frac{3}{2}x^2+1\right)$