$\left(3y^2-4h\right)\left(3y^2+4h\right)$
$\left(3-8\right)+\left(-5-2\right)-\left(-9+1\right)-\left(7-5\right)$
$7x-2y-10x+5+8y$
$\lim_{x\to0}\left(\frac{x^2+ln\left(cos\left(x\right)\right)}{x^4}\right)$
$\left(4a-3b+7\right)-\left(2a-b+8\right)$
$2\frac{x^2}{2}$
$\left(f+9\right)\left(f+5\right)$
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