$\lim_{x\to0}\left(\frac{x^2cotx+cosx-1}{x}\right)$
$x-6y=27$
$2\sin y=-1$
$\:\frac{x}{3x+1}=\frac{x-1}{2x+3}$
$\log\left(a\right)-z\log\left(b\right)$
$8\:=\:2y^2$
$\int\left(x+1\right)\sqrt{\left(x+1\right)^2+1}dx$
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