The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: $(a+b)(a-b)=a^2-b^2$.
Applying the trigonometric identity: $\cot\left(\theta \right)^2 = \csc\left(\theta \right)^2-1$
Solve the product $-\left(\csc\left(x\right)^2-1\right)$
Cancel like terms $\csc\left(x\right)^2$ and $-\csc\left(x\right)^2$
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