$\lim_{x\to0}\left(x\cdot cotg\:\left(\frac{\pi}{2}\right)\right)$
$x^2-4x+30,x=1$
$\left(\left(5\right)\cdot\left(3\right)\right)-\left(\frac{20}{-2}\right)+\left(\frac{6}{-2}\right)$
$\sqrt[4]{2x^3}$
$18n+6$
$6x^2+54x+120$
$\left(x^{\frac{9}{2}}+y^{\frac{9}{2}}\right)\left(x^{\frac{9}{2}}-y^{\frac{9}{2}}\right)$
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