$\frac{d^2}{dx^2}\left(u^5-u\right)$
$1x+1$
$-3\left|5-2^3\right|+3\:times-1.5$
$\lim_{x\to0}\left(\frac{\left(cos\left(x+m\right)-cos\left(x\right)\right)}{m}\right)$
$5x^2+4x^2+3$
$h\left(x\right)=\ln\sqrt{4+5x}$
$\left(-5m-4n\right)^2$
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