$\int-8xe^{-3x}dx$
$\frac{sin\left(x\right)sec^2\left(x\right)-16sin\left(x\right)}{sin\left(x\right)sec\left(x\right)+4sin\left(x\right)}$
$1.999-2$
$-2x^2+4x$
$\frac{a^9}{a^3}$
$\frac{0.9}{0.1}$
$-2x^2<4$
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