$\left(\csc x-\sin x\right)^2=9$
$2x^4+6^3-56x^2$
$\frac{2x+1}{x-3}\ge4$
$log28\left(4\right)+log28\left(7\right)$
$\left(1-\cos\left(x\right)\right)\left(1+\cot^2\left(x\right)\right)=1$
$4r^2-12r+7$
$81a^6+36-108a^3$
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