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JEE MAIN - Mathematics Hindi (2002 - No. 35)

कौन सा आवर्ती (periodic) नहीं है?
$$\left| {\sin 3x} \right| + {\sin ^2}x$$
$$\cos \sqrt x + {\cos ^2}x$$
$$\cos \,4x + {\tan ^2}x$$
$$cos\,2x + \sin x$$

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