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                Find the directional derivative of:
∅=(x+2y+z)²—(x—y—z)² at the point (2, 1, -1) in the direction of A=i—4j+2k.
Plz help show me work
            
        ∅=(x+2y+z)²—(x—y—z)² at the point (2, 1, -1) in the direction of A=i—4j+2k.
Plz help show me work
Answers
                    Answered by
            Steve
            
    Whatever you copied and pasted from mangled the special characters. Try spelling out special stuff, such as sqrt() etc.
    
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