$\lim_{x\to1}\left(\frac{x^3+2}{x^2-1}\right)$

$y=\frac{5}{x^7}\sqrt{25x^{14}+80x^6+\frac{64}{x^2}}$

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

$x=1.4\left(\log c-\log d\right)$

$\frac{y}{4}+182<179$

$\left|b^2cz^5+\frac{2}{3}b^2cz^5-\frac{5}{3}b^2cz^5\right|\cdot4$

$\left(x+4\right)\left(x-3\right)+\left(x+6\right)\left(x+4\right)-2x^2$