$\left(12x^4-9x^2+4x+5\right)-\left(-2x^2+8-6x^5\right)$
$\pi\int_1^3\left(2x+2\right)^2dx$
$3\cos^2\left(x\right)+2=7$
$a^{12}-b^{12}$
$-3\left(5x-2\right)\left(5x+2\right)$
$-6x^5+3x^4-12x^3$
$9\le x+7$
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