$8\cdot9+2\cdot5+7$

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

$-\frac{1}{2}cos\left(2x\right)\frac{1+cos\left(2x\right)}{2}+\frac{1}{4}cos\left(2x\right)+\frac{1}{4}=cos\left(x\right)^2-cos\left(x\right)^4$

$10m^3n^2p+30m^2n$

$-4+\left(-2+1\right)+5-\left|3-\left(1-2\right)+4\right|+1-2$

$y'=\frac{7x}{3y}$

$\int\frac{\sqrt{1-y^4}}{y^5}dy$