$3-4t^9+4st+3t^9-12st-12$
$\left[rs+4r-3s\right]^2$
$3-\left(\frac{1}{x-1}\right)\ge5$
$3y^2-12y+36$
$\int\left(\frac{1}{1-\cos\left(x\right)}\right)dx$
$\lim_{x\to0}\frac{\cot\left(2x\right)}{\ln\left(x\right)}$
$4csc^2x-9=0$
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