$\lim_{x\to0}\frac{1-\cos\left(4x\right)}{4x^2}$
$\left(6w+x\right)^2$
$x^2y^3-4xy^2$
$\left(10x^3+1\right)\left(10x^3+5\right)$
$1-9^4b^2c^6d^2e^4$
$x^5-x^4-12x^3+36+13x^2-36$
$12x^2+20x+3$
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