$\left(-27\right)\:-\:\left(-45\right)$
$\frac{1-\csc\left(t\right)^2}{\csc\left(x\right)^2}=0$
$\int\frac{x^2+x+1}{x^5-x^4-x+1}dx$
$\frac{4x^3-5x+1}{8-x^3}$
$9x+9y=z$
$4w^2+36wy+81y^2$
$\left(-x^2+11x-28\right)^2$
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