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let f(x,y) = 2xy+4y^2 a) find the rate of change f at the point P(3,2) in...

let f(x,y) = 2xy+4y^2
a) find the rate of change f at the point P(3,2) in the direction of u= [1,3]
b) in what direction does f have the maximum rate of change? what is the maximum rate id change?
Math   Calculus   
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