$\frac{x^2-4}{x+4}$
$\left(4x+1\right)\left(4x+9\right)$
$x\left(\sqrt{x^2+1}-x\right)$
$\left(x^2-y^2\right)-\left(x-y\right)^2$
$\sin\left(10x\right)\cos\left(7x\right)$
$6x+5x^2+7x^2+3+6x$
$4m-\left(2m+n-3\right)+\left(-4n-2m+1\right)$
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