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The number of solutions of the equation 1 + sin^4 x = cos^2 3x, x ∈ [-5p/2 , 5p/2] is :

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The number of solutions of the equation 1 + sin4 x = cos2 3x, x ∈ [-5p/2 , 5p/2] is :

(1) 5 (2) 3 (3) 7 (4) 4  

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Correct option   (1)  5 

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