$-9=-9$
$\left(3c-7\right)\left(9c^2+21c+49\right)$
$-15x\:and\:-15\:$
$\left(\frac{1}{3}x-\frac{2}{7}\right)^{3}$
$2x\cdot\frac{dy}{dx}\cdot\left(x^2+y^2\right)=y\cdot\left(y^2+x^2\right)$
$\lim_{x\to0}\left(\frac{8sec^2\left(2x\right)tan\left(2x\right)}{sin\left(x\right)}\right)$
$4+x^4+1$
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