已知抛物线C：x=s^2+1/s^2-2,y=2s-2/s,(s为参数),将抛物线化为直角坐标系方程
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\u8fd9\u9898\u5f88\u57fa\u7840\u7684\u5427\uff0c\u79fb\u9879\u5c31\u53ef\u4ee5\u4e86\uff0c\u4f60\u662f\u521d\u4e2d\u751f\u5427\uff0c\u6709\u597d\u597d\u5b66\u3002
(y/2)²=(s-1/s)²=s²-2+1/s²=x-2
即：y²/4=x-2
所以：y²=4(x-2)
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