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Find the directional derivative of:

âˆ…=(x+2y+z)Â²â€”(xâ€”yâ€”z)Â² at the point (2, 1, -1) in the direction of A=iâ€”4j+2k.

Plz help show me work

Whatever you copied and pasted from mangled the special characters. Try spelling out special stuff, such as sqrt() etc.

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