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∫ 2 x sin 2 x 5 sin dx is equal to – (where c is a constant of integration)

1. 2x + sin x + 2 sin 2x + c
2. 2x + sin x + sin 2x + c
3. x + 2 sin x + 2 sin 2x + c
4. x + 2 sin x + sin 2x + c

Correct answer: x + 2 sin x + sin 2x + c

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