$2.\left(-3\right)\cdot\left(-2\right)-\left(-2\right)\cdot7\cdot\left(-1\right)\cdot3\cdot[-2+5\cdot2-4\cdot\left(5-3\right)]$
$81x^2+6x+3$
$\lim_{x\to3}\left(\frac{x-3}{ln\left(x-3\right)}\right)$
$6\left(781\right)$
$sin^2x=2\:cos-\frac{1}{4}$
$\int\left(e^{6z}\cos\left(2z\right)\right)dz$
$\frac{x^3+5}{x^2-1}$
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