$\lim_{x\to3}\left(\frac{x+1}{x^2-6x+9}\right)$
$\left(x-2\right)\cdot\left(1-3x+3x^2-x^3\right)$
$sin2x-1=0$
$-12+\left|12+\left(-8\right)\right|$
$\left(-21\right)-\left(-35\right)+\left(-60\right)$
$2cos^2x=sen\:x-1\:$
$\int\left(2t^2\cdot e^t\right)dt$
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