Work Step by Step
Re-arrange the given equation as: $=\cot \theta \times \cot \theta -\csc^2 \theta$ $=\cot^2 \theta -\csc^2 \theta$ $=\cot^2 \theta -(\cot^2 \theta+1)$ $=\cot^2 \theta -\cot^2 \theta -1$ $=-1$
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