$\left(a-b-c-d\right)^2$
$\left(2+x^2\right)\left(1-2x\right)^4$
$\frac{dy}{dx}=\frac{xe^x}{y\sqrt[2]{1+y^2}}$
$\frac{\cos\:\left(-4y+3x\right)+\cos\:\left(x-2y\right)}{2}$
$\left(8a+16b\right)\left(8a-16b\right)$
$x^4+9x^2+25$
$\left(x-1\right)\left(x-6\right)$
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