$\left(9x^2\right)\left(3x+1\right)$
$\left(2a\:+\:3\right)^2$
$\left(a-x\right)\left(x+a\right)$
$\lim_{x\to a}\left(\frac{\cos\left(x\right)-\cos\left(a\right)}{3x-3a}\right)$
$\:\frac{\left(sin\left(x\right)cos\left(y\right)+cos\left(x\right)sin\left(y\right)\right)}{cos\left(x\right)cos\left(y\right)}=tan\left(x\right)+tan\left(y\right)$
$x^2-5\left(x-3\right)\left(x-2\right)$
$\frac{u^4v^3}{\left(2v^4\right)^4}$
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