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If ƒ(x) = x 2 sin x sin 2 3 x cos 2 x 2 sin x sin 2 x cos 2 3 x 2 sin 3 x sin 2 x cos 2 2 4 4 2 4 4 2 4 4 + + + , then 5 1 ƒ ′ (0) is equal to :

1. 1
2. 2
3. 6
4. 0

Correct answer: 0

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