2 cos2 θ = 3 sin θ, 0° < θ < 90°எனில், \(\left(\dfrac{1}{2} \rm cosec^2 \ \theta - \cot^2 \theta \right)\) இன் மதிப்பு என்ன?   

1
\(\dfrac{1}{4}\)
2
\(\dfrac{1}{2}\)
3
0
4
-1

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