$\int\frac{\left(1-\cos\left(x\right)^2\right)\cdot\sin\left(x\right)}{\cos\left(x\right)\cdot\left(1+4\cos\left(x\right)^2\right)}dx$

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

$\frac{3u+4}{-u-3}$

$-\left(5-3\right)\:\left(2+10\right)$

$2^4\cdot3^{-3}\cdot2^8$

$\left(x+2\right)\left(x^2+x-7\right)+10$

$x''-x=0$