$\frac{4x^6-2x^4+5x^2}{x^2}$
$\int_2^4\frac{\sqrt{x^2-1}}{x}\:dx$
$-23\cdot3$
$\frac{d}{dx}\left(\:x^3+y^3=6x^2y-9+2^{\frac{3}{2}}\right)$
$\frac{2x^4-250x}{\sqrt{x^2}-9-4}$
$\lim_{x\to\infty}\frac{3^x+4^x}{3^{x+2}-4^{x+1}}$
$\int\left(tan2x-sec2x\right)^2\:dx$
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