$5x+7=3x+19$
$sen\:x=\frac{cos\:x}{ctg\:x}$
$4y^4-4y^2+1$
$\left(x-5b\right)\left(x+5b\right)-\left(x+2b\right)^{\left(2\right)}+30b^{\left(2\right)}+4xb$
$3x^{-2}+2x^{-2}$
$\int_{-2}^0\left(2xy\right)dy$
$\lim_{x\to0}\left(\frac{logsin2x}{logsinx}\right)$
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