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) ( sin vt xk A yA kx tsin( ) Z (2)
k Á¦¸¥„ªnµÁ¨ ‡¨ºÉ œ (Wave number) ®¦º°‡nµ‡Š˜´ª„µ¦Â¡¦n¥µ¥ (Propagation constant) ×¥š¸É k 2 S
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) ( sin vt xk A yA kx tsin( ) Z (3)