$\int\left(11x\:-\:7\right)^{-3}dx$
$\frac{cosx-cos3x}{sinx-sin3x}=-tan2x$
$\int\left(x^2+1\right)\left(5^{x^3+3x}\right)dx$
$xy+2y-x-2$
$\frac{d}{dx}\left(xy-x^2+y=0\right)$
$+4-13+2-23+3-1+16-17-2-5$
$\lim_{x\to\infty}\left(\frac{3^x+x^x}{x^x}\right)$
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