$\left(8a-7\right)\left(8a+\right)$
$2x-6y$
$\frac{2tanx}{1+tan^2x}$
$\frac{dy}{dx}-y=7e^x$
$\sin\left(2x\right)=0.356$
$10ba^4-15b^2a^3+5b^3a^2$
$ab^{-2}=\:\frac{a}{b^2}$
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