$\left(y-9\right)\left(y+5\right)$
$2m^2-2m^3$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{7x}\right)$
$16x^2-16+4$
$\frac{sin\left(x\right)+tan\left(x\right)}{cot\left(x\right)+csc\left(x\right)}$
$2.1\cdot1.6-1.5$
$y^2-0+49$
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