$\lim_{x\to0}\left(\frac{6-6cos}{sin2}\right)$
$x^2-5x<-6$
$y'=xy-x-2$
$\cos20\left(\tan20+1\right)$
$7x^2-1000x-4$
$\lim_{x\to-1}\left(\frac{x^3+2x^2+x}{x^3+x^3+x-1}\right)$
$\int\tan\left(2x^7\right)x^6\cdot dx$
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