$\frac{1}{csc\left(u\right)}\frac{du}{dt}=cos\left(\frac{x}{2}\right)$
$3x^2-3xy+6xy^2$
$6m\left(3x-y\right)+9n\left(6x-24\right)$
$\lim_{x\to0}\left(\frac{2x-sen\left(x\right)}{x}\right)$
$5x^2+20x+12=0$
$\left(3x^2y^3-5y^3x\right)^2$
$z^4+10z^2+24$
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