$2\:\sec\csc a=\:\sec a$
$\frac{dy}{dx}=e^{x-3y},y\left(0\right)=2$
$+18+\left|-5+2\right|$
$\frac{x+1}{x-6}>7$
$\frac{x^{12}-64}{x^4-4}$
$-36=18$
$\left(-8\right)^6.8^2$
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