$\lim_{x\to-\infty}\left(-2\right)$
$7gd^4-14gd^2$
$3-\frac{2}{3}x$
$\frac{50}{\sin\left(80\right)}$
$x^2+18x+68=0$
$\left(x+y\right)^4+2\left(x+y\right)^2-3$
$\int_4^8\left(xe^{-x}\right)dx$
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