$\lim_{x\to-0.01}\left(\frac{sen2x}{x}\right)$
$\left(-7x-3\right)\left(-11+2x\right)$
$\left(\frac{-6y}{2}\right)^2$
$\int-7x^2e^{-4x}dx$
$\int\frac{5x^{3}-9x^{2}+8x-16}{x^{4}-6x^{2}+8x-3}dx$
$4x^2=400$
$6x-6y-5=0$
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