$sec\left(tan^{-1}\right)\left(\frac{\sqrt{3}}{3}\right)$
$\frac{1}{4}-\frac{x^2}{9}$
$\int x.e^{-sx}dx$
$\left(-68\right)\left(0.5\right)$
$3\left(x+4\right)-8x>27$
$-11+2x^4-3x^3+3x+x^3-3x^4+2x^2+1$
$\lim_{x\to2}\left(\frac{x^2-4}{2x+4}\right)$
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