[中學] 圓的參數式
x = sin^2x
y = sinx*cosx
0<=x<=拍
我把他轉換後變成
x = 1/2 - 1/2cos2x
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想請問這個負號怎麼消?
y = 0 + 1/2sin2x
0<=x<=2拍
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都是別人的錯 你自己都沒錯
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