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If ∫ θ + ) – x sin( x cos x sin x cos x sin 3 3 2 3 2 3 dx = A θ θ sin – x tan cos + B C x cot sin – cos + θ θ , Where C is the integration constant, then AB is equal to

1. 2 sec θ
2. 4cosec (2 θ )
3. 4 sec θ
4. 8 cosec (2 θ )

Correct answer: 8 cosec (2 θ )

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