vnd line directional derivative of the function f(x,y)=In (1+x² + y²) where u= 0√10+2√√10x 10+ 10x+10y² O√10+2√/10 x 3√10+6√/10y 10+ 10x²+10y² 10+ 10x²+10y² O 3√/10+6/10y 10+ 10x²+10y² 0 1+2x -3+6y √10+√10x²+√102 √10+√10x²+√√102 1+2x 3+6y √10+√10x²+√10y² √10+√10x²+√10² 3 10

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