$-100-8+-5-160$
$\left(\frac{x^2}{2}+1\right)^2$
$\left(2\left(-1.70\right)+3\right)$
$\int sec\left(u\right)tan\left(u\right)du$
$81x^4-16y^2$
$x^2-6x-280$
$y'=-4y+3\cdot\:\:e^{-t}$
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