$12x^2y^2+15xy^2+6x^2y$
$\lim_{x\to1}\left(\frac{e^{6x}-6x-1}{5x^2+3x-\sin\left(3x\right)}\right)$
$4c^2+16cd-16d^2$
$20+90+513$
$\csc^2x\cos^2x=2\csc^2x$
$7p-2q-q+3r+4r$
$-3\cdot\frac{4}{2}$
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