$4\left(4y-3x\right)$
$\frac{2}{\sin\left(x\right)}=\frac{\sin\left(x\right)}{1+\cos\left(x\right)}+\frac{\sin\left(x\right)}{1-\cos\left(x\right)}$
$\left(6b^3c^2-7\right)\left(6b^3c^2+7\right)$
$\sec\left(89.4\right)$
$5n^2+39n-54$
$3a^4\cdot5a-18az$
$\left(x^{2p-3}-5z^3\right)\left(x^{2p-3}+5z^3\right)$
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