[考古] 90交大
Suppose that eq. F(x,y,z) = 0 implicitly defines each of the three variable
x,y,z as function of the other two:
z = f(x,y) y = g(x,z) x = h(y,z)
If F is differentiable and Fx , Fy , Fz are nonzero, show that
6z 6x 6y
----x----x---- = -1 6是partial 囧rz 而 ---x--- 中間的x是乘
6x 6y 6z
拜託各位高手了 ○r2
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