$\left(b^3+1-5b^2\right)-\left(3b^3-2-8b^2\right)$
$\left(-\frac{6}{2}\right)^2$
$a=\cos\left(70\right)+\cos\left(50\right)\sec\left(10\right)$
$\frac{x^2-225}{x+15}$
$16x^2+26x+3$
$-3x^2+6x+5$
$\left(x+6\right)\left(x-12\right)$
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