[多變] 求切面的點

[stitchcca (阿迪)]

Find the points on the hyperboloid x^2 + 4y^2 - z^2 = 4

where the tangent plane is parallel to the plane 2x + 2y + z = 5.


答案是 (2,1/2,-1),(-2,-1/2,1)

請問這題要怎麼求出答案

謝謝~

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