$4x^2-49$
$\frac{x^9+y^9}{x+y}$
$49a^6+9b^{10}-42a^3b^5$
$7p+3-5p^3+2p^3+8-4p^5$
$-\left(-4.3\right)+2.7-\left(-7.3\right)+\left(-5.2\right)$
$\lim_{x\to\infty}\frac{\left(-8\right)^x}{3^x}$
$4\sec\left(x\right)+4=-2\sec\left(x\right)-8$
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