$cos\left(x+\pi\right)=\frac{1}{2}$
$\left(5x-3\right)^2-2\left(3x-5\right)\left(3x+5\right)$
$\frac{2x+x^2-24}{x-4}$
$\left(18a-29\right)^2$
$-2x^2\cdot6x$
$2x^2+9x-11$
$\left(x+8\right)^2\cdot6$
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