$\lim_{x\to-\infty}\left(\frac{x^4-40}{x-6}\right)$
$\int tan^7xsec^3xdx$
$\frac{1}{x^2\sqrt{81x^2-1}}$
$3\cdot\left(x^2+4\right)\cdot\left(x-1\right)\cdot\left(x^2+2x+1\right)$
$9\cdot8+1+5\cdot7$
$\frac{d}{dx}2^{ax}$
$2x+y=-\frac{3}{2}$
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