$\left(4^7\right)^4$
$\frac{dy}{dx}-e^{2x-3y}=0$
$\frac{dy}{dx}=\frac{1}{\cos\left(3y\right)}$
$\left(12x-5y\right)\left(12x+5y\right)$
$-12\:\cdot28$
$\frac{\cos\left(x+a\right)-\cos\left(x-a\right)}{x}$
$144m^2-400n^8$
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