$\lim_{x\to\infty}\left(\frac{x^3}{2\left(1+x\right)^2}\right)$
$y'=y-xy^3e^{-2x}$
$\cos^2\left(x\right)+\frac{\tan^2}{1+\sec\left(x\right)}+\sin^2\left(x\right)=\sec\left(x\right)$
$x^{2}-2x-4=0$
$5\left(-2\right)^2\left(4\right)$
$3.8-6.2$
$100x-100+90-90x$
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