site.iugaza.edu.pssite.iugaza.edu.ps/selshamy/files/2010/02/CH11.pdf · To the right if a > 0...
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site.iugaza.edu.pssite.iugaza.edu.ps/selshamy/files/2010/02/CH11.pdf · To the right if a > 0 and to the left if a < 0 y = By interchanging the variables x and y, we obtain