$\lim_{x\to0}\left(\frac{9sin^2x}{1-\sec\left(x\right)}\right)$
$2+5\cdot6-5+12-4\cdot8$
$1x^2+4x$
$\frac{d^2}{dx^2}\left(50x^4+12x^3-15x^2+4x-10\right)$
$y'=y-2$
$-16-3-6+3+6+2-6+2-5-1$
$\frac{x-4xy}{x}$
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