$\frac{1}{2}\sec\left(x\right)\csc\left(x\right)$
$2x+7\le19$
$\frac{dy}{dx}=\frac{x+3x^2}{y^2}$
$\lim_{x\to0}\left(3x+cosx\right)^{\frac{1}{x}}$
$\left(\frac{m^6t}{7}\right)^2$
$\frac{3x^3+2x^2-3x-2}{x^2-1}$
$2x\sqrt[2]{4^4}x\sqrt[2]{2^{-2}}$
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