$3\left(4a^4+4a^3-3a^2\right)$
$x^2-245x+1764$
$\left(6\right)\left(-2\right)+\left(-10\right)\left(-3\right)$
$\lim_{x\to0}\left(\frac{\sin\left(2x\right).\cos\left(3x\right)}{x^2}\right)$
$16t^3x^2-4t^3y^6$
$tg\left(270+a\right)=-cotg\left(a\right)$
$\frac{8u^2v^{-1}}{2u^{-1}v^3}$
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