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曲線x=t,y=t^2,z=t^3的切線斜率 x=1,y = 2t,z=3t^2 切線平行於平面x+2y+z=4,切線斜率與平面的法向量點積為0 1*1+2t*2+3t^2*1 = 0 t= -1或-1/3,代入直線方程 x=-1,y=1,z=-1,或x=-1/3,y=1/9,z=-1/27
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