$5x^4+10x^2-15x^3$

$\ln\left(x\right)+\frac{dy}{dx}\sin\left(y\right)=0$

$y^2-28y+y$

$2\sin\left(\frac{1}{2}x\right)=1$

$\left(x-\frac{3}{5}\right)\left(x+\frac{5}{4}\right)$

$4x^2-3+x^2-x+2x-4$

$\lim_{t\to2}\left(\frac{\sqrt{\left(t+4\right)\left(t-2\right)^{4}}}{\left(3t-6\right)^{2}}\right)$