$\int_2^{\infty}\left(\frac{1}{2}\right)dx$

$2a^4+5b^4-2a^4+7b^4-2$

$140\cdot5$

$\lim_{x\to0}\left(\frac{x^2e^x}{tan^2x}\right)$

$\left(x^2-3x+2\right)\cdot\:\left(x-1\right)$

$\lim_{x\to\frac{x}{2}}\left(\frac{\ln\left(\cos\left(x\right)\right)}{\ln\left(\tan\left(x\right)\right)}\right)$

$x^2+10x=-50$