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Find the directional derivative of the function at the given point in the direction of the...

Find the directional derivative of the function at the given point in the direction of the vector v.

f(x,y,z)= x2y3+2xz+yz3 (-2,1,-1) v= <1,-2,2>

Use the chain rule to find dz/dt. z=sin(x,y) x= scos(t) y=2t+s3

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