$\left(2+3x^2\right)\cdot\left(4+6x^2+9x^4\right)$
$4m^2-28m+49$
$\lim_{x\to2.999}\:\left(\frac{x-3}{x^2-9}\right)$
$\csc\left(x\right)\cdot\cot\left(x\right)+\sin\left(x\right)$
$5x^2+15x=40$
$a^2-16a+64$
$1-b^5$
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