The integral of the given function cos 2x cos(-x)dx is equal . sin 3x + 3 sinx А. + C 6 sin 3x – 3 sinx B. + C 6 sin 3x + 3 sinx C. + C 12 -sin 3x – 3 sinx D. + C 6 E.None of the above

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A: As per our guideline we are allowed to answer only one question. Kindly repost the other question as...