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The number of solutions of the equation 1 + sin 4 x = cos 2 3x, x ∈ ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ π π − 2 5 , 2 5 is :

1. 5
2. 3
3. 7
4. 4

Correct answer: 5

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