$\left(9x^6+7x^5+6x^4+2\right)\:+\:\:\:\left(9x^6+2x^5+6x^4+3\right)$

$\frac{3}{4}x+2=20$

$\left(2x^4-9\right)^2$

$2\cdot\frac{7}{4}\cdot\frac{16}{28}\cdot9$

$\frac{\left(csc^2x-1\right)}{\left(cosx-2\right)}$

$\frac{x^2+3}{x^2-1}<-2$

$\lim_{x\to\infty}\left(\frac{x^2+1}{ln\left(x\right)}\right)$