$1+6+13-7$
$\lim_{x\to-1}\left(\frac{4x^4+9x^3+9x+14}{x+1}\right)$
$\int t\sqrt{at-b}dt$
$\ln\left(\sqrt{\frac{5x^3y^4}{z^2}}\right)$
$\left(5c-1\right)\left(5c+1\right)$
$\lim_{x\to0}\left(7x^4lnx\right)$
$y=7x^{-x}$
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