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9. The equation for the tangent plane to the surface x² + 4y² + 9z² = 3 at the point is ________.

其他申論題

8. If f(x,y) = , for x ＞0 and y , then =_________

10. The shortest distance between the parabola y = x2 and the point (6, 3) is ________.

1. Define f(x, y) = for x, y . Show that f is not differentiable at (0,0).

2. Let f(x) =Show that f is differentiable at each x and that f' is not continuous at 0.

3. Two right circular cylinders of radius 1 have axes that intersect at right angles. Find the volume of the solid common to the two cylinders.

(b) (5%) does not exist

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