$-4\left(1-5\right)-\left(4^2\right)$
$\lim_{x\to1}\left(\frac{\sin\left(\pi x\right)}{x-1}\right)$
$1+\frac{tan^2\left(x\right)}{csc^2\left(x\right)}$
$xy^3+xy$
$x^3+40x^2$
$\frac{2x^3-7x^2-8x-2}{x+1}$
$\left(8^6\right)^2\::\:\left(8^3\right)$
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