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(\csc^2 \theta)^2 - (\cot^2 \theta)^2 = (\csc^2 \theta - \cot^2 \theta)(\csc^2 \thetaa + \cot^2 \theta)
(\csc^2 \theta)^2 - (\cot^2 \theta)^2 = (\csc^2 \theta - \cot^2 \theta)(\csc^2 \thetaa + \cot^2 \theta)
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