$\lim_{x\to2}\left(\frac{tan^2-\left(x-2\right)}{x^2-4}\right)$
$8x^3-12x^3+6x+1$
$x^3+9x^2+20x+12$
$\lim_{x\to0}\:\left(a^x-b^x\right)\:\frac{1}{x}$
$-23+28-183$
$\frac{dy}{dx}=\left(0.8-y\right)\left(0.6-y\right)^2$
$\int_{-10}^25xdx$
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