$\frac{18x}{17}<15$

$yx-x^2-2x^3=0$

$2-2+2-2$

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

$\lim_{n\to\infty}\left(\frac{\sin\left(\frac{1}{n}\right)}{\arctan\left(\frac{1}{n}\right)}\right)$

$\frac{\cos\left(x\right)^2}{\sin\left(x\right)\cdot\tan\left(x\right)-1}$

$+\:4+1+8+2+3$