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 [˜A—§•û’öŽ®] Z=Sin(ƒÎ*X+0.5*Sin(2*ƒÎ*X)
                 *1.7*Sin(ƒÎ*Y))
                 *SIN(ƒÎ*Y+0.5*Sin(2*ƒÎ*Y)
                 +1.7*Sin(ƒÎ*X))
              Z=0      ƒÎ=3.14159

 [•û’öŽ®‚Ì�À•WŒn] ŠÖ�”�À•WŒn

 [•û’öŽ®‚Ì�À•W•Ï�”] X,Y

 [�F] Z=�ƒ0‚Å�®�AZ�„0‚Å�ó‰©�B

 [•û’öŽ®‚Ì‹O�Õ] •û’öŽ® Z=0‚Ì‹O�Õ‚Í�®‚Æ
                �󉩂̋«ŠE�ü�B

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