$tan^2x+9tanx+3=0$
$\int\left(8x\log\left(7x\right)\right)dx$
$500-\left(-5\right)$
$4x^2+-8y+-3xy+5x^2+2xy$
$0.2^{10}$
$\lim_{x\to0}\left(\ln\left(1+x\right)^{sen\left(x\right)}\right)$
$y=4\cot\left(4\left(-\frac{\pi}{16}\right)\right)$
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