$\ln\left(cotx+cscx\right)+\ln\left(cot-cscx\right)$
$\int13xe^{-2x}dx$
$4x-3\ge17-x$
$\left(x^3y+2x^4\right)dx+x^4dy=0$
$\int\left(\frac{-x}{\sqrt{x-9}}\right)dx$
$2x+3y-4z+\left(-5x\right)-7y+5z$
$6x^2-9x+2$
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