$90\sqrt{4}-5\sqrt{25}$
$\frac{3x+1}{3x^2+3x}$
$-x\left(2-x\right)^2$
$\left(6m\:+\:10\right)\:\left(6m-10\right)$
$10x-5-x^2$
$\lim_{x\to+\infty}\left(\tan\left(\frac{1}{x}-\frac{\pi}{2}\right)\right)$
$\lim_{x\to e}6\ln\left(x\right)$
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