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The integral ∫ π π 3 / 6 / 3 / 4 3 / 2 dx x ec cos x sec is equal to :

1. 3 1 3 5 3 3 −
2. 3 2 6 5 3 3 −
3. 3 1 3 4 3 3 −
4. 6 5 6 7 3 3 −

Correct answer: 6 5 6 7 3 3 −

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