$\lim_{x\to1}\frac{x^2+3x-4}{x^2-3x+2}$
$-2\left(8c-5\right)+-8\left(-5c+5\right)$
$3\tan^2x-2=5\sec^2x-9$
$\left(02-2x\right)^2$
$\frac{dy}{dx}-\sqrt{y}=x\sqrt{y}$
$c^4+8c^2+16$
$\lim_{x\to0}\left(\frac{2x^3-8x+5}{9x^3+5}\right)$
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