$\frac{d^4}{dx^4}\left(\cos x\right)$
$x-2>10$
$7pq^3+48p^3q^2+5p^3q^2$
$16y^2+72y^2+81z^2$
$6xy^2-10xy^2$
$\left(a-\frac{cos\:y}{sen\:y}\right)$
$49g^2+56gd+16d^2$
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