※ 引述《pp20624 (kk)》之銘言：
: find the tangent plane to the graph given by
: z^2 - 2x^2 - 2y^2 =12 at the point(1,-1,4).
: 有請 我程度真的很差QQ
grad f(x,y,z)=(-4x,-4y,2z)
(1,-1,4)代入=> (-4,4,8) => (-1,1,2) => -x+y+2z
再一次把點代入
-x+y+2z=6
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