$-x^2+8x^2$
$\frac{dy}{dx}=-x^2+6$
$x-3x-1$
$\frac{27x^3+8y^3}{3x+8y}$
$\frac{x^2+x+6}{x^2+5}$
$\lim_{h\to0}\left(\frac{\left(x+h\right)^2-x^2}{h}\right)$
$3x^2-5x^2+52x+12$
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