$\left(43-25\right)-\left(3-65\right)$
$\frac{4\csc\:\left(2x\right)}{\sin\:\left(2x\right)}$
$\left(x^3+2x^2+k\right).\left(x-3\right)$
$5x^2\:y+10xy-2x-4\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\lim_{n\to\infty}\:1^{n+1}$
$\int t\left(\ln^2\left(t\right)\right)dt$
$\lim_{x\to\infty}\left(1+x^{-1}\right)^{x^2}$
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