$55-\left(66-2\right)$
$\lim_{x\to0}\left(\frac{tan\:4x\:-\:sen\:3x}{4x\:-\:tan\:5x}\right)$
$2x-5=-7$
$2x^2-11x-6=0$
$\int6x^2e^{8x^3+4}dx$
$ydx+\left(3x+4y\right)dy=0$
$\int\left(y+2\right)\sqrt{y+3}dx$
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