$\lim_{x\to0}\left(\frac{-senxcosx}{x}\right)$
$x^2-2x+8y+9=0$
$\int ln^2x^3dx$
$\left(11x-9\right)\left(11x+9\right)$
$\int\left(\frac{1}{e^x\left(1+e^x\right)}\right)dx$
$6x+3<57$
$\csc\left(x\right)=5-2\csc\left(x\right)$
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