[�}–¼] •Ç–ä—l20

 [˜A—§•û’öŽ®] Z=Sin(3*ƒÎ*X)*Sin(7*ƒÎ*Y)
                 +Sin(3*ƒÎ*Y)*Sin(7*ƒÎ*X)
              Z=0      ƒÎ=3.14159

 [•û’öŽ®‚Ì�À•WŒn] ’¼Œð�À•WŒn

 [•û’öŽ®‚Ì�À•W•Ï�”] X,Y

 [�F] Z=�ƒ0‚ÅŠŒ�F�AZ�„0‚ÅŠD�F�B

 [•û’öŽ®‚Ì‹O�Õ] •û’öŽ® Z=0‚Ì‹O�Õ‚ÍŠŒ�F
                ‚ÆŠD�F‚Ì‹«ŠE�ü�B

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