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Find the velocity of the wave packet of the following two combing waves
y1 = Acos [ (k+¡âk)x-(w+¡âw)t ]
y2= Acos [ (k-¡âk)x-(w-¡âw)t ]
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ÀÌÀü±Û :
Áøµ¿¿¡ ´ëÇؼ Áú¹®ÀÖ½À´Ï´Ù. (¹°¸®´¾´¾)
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ºûÀÇ °æ·Î (»ç¶ûÀÌ)