$5x^2-x\cos\left(5x-3x\left(x-8\right)-11\right)$
$\sqrt{45x^4}$
$\left(4x+1\right)^2-\left(4x-1\right)^2$
$3x-4x^3+8-2x^3-5x$
$\frac{3x^2y+6xy}{9x^2y+12xy}$
$15a^2-8a^2+a^2$
$99+4$
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