$cos\left(125\right)-cos\left(10\right)$
$\frac{\left(-10x^7-8x^5+4x^7-x\right)}{2x^2+1}$
$\int\sec^55x\:\tan^35x\:dx$
$\lim_{x\to\infty}\left(\frac{x}{x^2+5}\right)$
$6x^2-45x+21$
$4x\ge8$
$3-2\left(-5\right)\left(2+3\left(-4+3\right)\right)$
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