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Find the directions in which the function increases and decreases most rapidly at p0.Then find the...

Find the directions in which the function increases and decreases most rapidly at p0.Then find the derivatives of the function in these directions

f(x,y,z)=(x/y)-yz p0(2,1,-3)

The direction in which the given function f(x,y,z)=(x/y)-yz increases

most rapidly at p0(2,1,-3) is u=?? i ??j ??k

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