$\left(t^2+1\right)\left(t^3+t^2+1\right)$

$\lim_{x\to8}\left(\frac{\sqrt{2x}-\sqrt{6x-32}}{x^2-8x}\right)$

$\int\ln\left(5x-5\right)dx$

$\int-\frac{2}{x^{\frac{1}{4}}}dx$

$\frac{dy}{dx}=-\frac{2x}{3y^2}$

$\left(7.-1.-2.-1\right)$

$\sin\left(2x\right)+\sin\left(6x\right)-2\sin\left(4x\right)=0$