$\cot\left(2x\right)=\frac{\cot^2x-1}{2\cot x}$
$9t^2-72t+144$
$8.8^2$
$1y\:-\:2y^2$
$1+sin\left(x\right)=\frac{csc\left(x\right)+1}{csc\left(x\right)}$
$\left(2x+2\right)\left(x+1\right)$
$x+1<-8$
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