$6x^2-140=-2x$
$\lim_{x\to\infty}\frac{\sqrt{x^2+1}}{x+1}$
$tan\left(x^2+5x\right)$
$\frac{dy}{dx}=xy-ln\left(x^{2y}\right)$
$8-2x-2$
$10x^3+25x^2+15x$
$\frac{36x^3}{6}-12x-42$
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