$-10.3+5+1.8$

$\left(7x^4-9\right)^2$

$\int\frac{r^3-3r^2-9r+2}{r+2}dr$

$\left(3x^2y^3-4\right)\left(3x^2y^3-7\right)$

$\frac{\cot^2\left(x\right)-1}{1+\cot^2\left(x\right)}=\cos2\left(x\right)$

$\frac{2x-3}{x+1}\ge1$

$\frac{d}{dx}ln\left(\arctan\left(3x^5\right)\right)$