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Which of the following functions is periodic

(A) cos2 x + sin x3 + tan (x4 ) 

(B) cos2 x + sin x3 + tan4 x 

(C) cos2 x2 + sin x3 + tan4 x 

(D) cos 2x + sin 3x + tan 4x

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Correct Option:- (D)

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