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) ) 2 x sin 6 x (sin ) 4 x sin 3 x sin 2 (( x tan lim 2 / 1 2 2 / 1 2 2 2 x + + − + + π → is equal to-

1. 12 1
2. 18 1 −
3. 12 1 −
4. 6 1

Correct answer: 12 1

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