The directional derivative of the field $u(x, y, z)=x^{2}-3 y z$ in the direction of the vector $(\hat{\imath}+\hat{\jmath}-2 \hat{k})$ at point (2,-1,4) is

The directional derivative of the field $u(x, y, z)=x^{2}-3 y z$ in the direction of the vector $(\hat{\imath}+\hat{\jmath}-2 \hat{k})$ at point (2,-1,4) is

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