$5x^2-10x+3$

$\lim_{x\to0}\left(\frac{sin4xtan6x}{x^2}\right)$

$-3x+3>-2x+1$

$-100\left(-100\right)-100-\left(100\right)-100\left(-199\right)$

$-12m^2n^3+9n^6+4m^4$

$\left(\:2xy\:+\:3x\:-\:5y\:+\:9\:\right)\:+\:\left(\:xy\:-\:5x\:-\:2y\:-\:12\right)$

$\lim_{x\to+\infty}\left(\frac{x\left(2+sin\:x\right)}{x^2+11}\right)$