The first term of a progression is $$\(\sin ^{2} \theta\)$$, where $$\(0< \theta< \frac{1}{2} \pi\)$$. The second term of the progression is $$\(\sin ^{2} \theta \cos ^{2} \theta\)$$ It is now given instead that the progression is arithmetic. Find the common difference of the progression in terms of $$\(\sin \theta\)$$. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................

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