$x^4\left(1-\frac{5}{x+6}\right)$
$\sec^2\left(x\right)-2\sec\left(x\right)-8$
$y'+e^{-4x}=0$
$-8845+771$
$20a^{12}b^2+6a^8b-20^9b^3$
$\left(0\right)\left(-1\right)+\left(-1\right)\left(3\right)+\left(-2\right)\left(2\right)$
$11^2\:-\:7^2$
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