$8+\frac{8}{4}$
$\lim_{x\to\frac{\pi}{4}}\left(\cot\left(x\right)-1\right)\sec\left(2x\right)$
$-20x=-360$
$\left(\frac{x^{10}}{x^2-y^2}\right).\left(x^2-y^2\right)$
$z^3-\left(mn\right)^3$
$\left(2x+5\right)^2\left(5x+2\right)^2$
$15.4+\left(-2.9\right)$
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