$\int\frac{\cos}{sen}2cos\:dx$
$\lim_{x\to\infty}\left(\left(x^3-7x^2\right)^{\frac{1}{3}}-x\right)$
$x^3-xy+4y=1$
$17-3y\le-2y-3$
$\frac{dy}{dx}-xe^{x^2-y}=0$
$\left(y^2\:x\:-3\right)x\:2$
$\frac{6x^4+2x^2+11x^3-x+5}{3x+2x^2+1}$
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