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     EduGorilla 
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    What will be the derivative of  (x sin x + cos x)(x cos x – sin x)?

    Options :-

    1. (x2 cos 2x + x sin2x)
    2. (x cos x – x sin2x)
    3. (x2 cos 2x – x sin2x)
    4. (– x2 cos 2x – x sin2x) 
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