$-x^3+3x^2-4x+5+x^3+3x^2-5x+7$
$x^2+bx+x$
$\cos^2\left(9x\right)-\sin^2\left(9x\right)$
$\left(x+x^2+x^3\right)^3$
$-16-3-6+3+6+2-6+2-5-1$
$\left(5\right)\:-\:\left(2\right)\cdot\left(-8\right)$
$\lim_{x\to3}\left(\frac{x^2-2x-3}{x^2+2x-3}\right)$
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