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由Failure4Life编辑: 6/10/2014 3:29:43 AMLol, that's not a sine wave that is a depreciation graph. Are you in 8th grade? [url=http://en.wikipedia.org/wiki/Sine_wave]lrn2math [/url] If you have a graphing calculator put in the equation y = sin(x) and see what you get.