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(Solved): Find The Directional Derivative Of F(x,y)=sin(x+2y) At The Point (-4, -4) In The Direction ?=?/6. ...

Find the directional derivative of f(x,y)=sin(x+2y) at the point (-4, -4) in the direction ?=?/6.
The gradient of f is:
?f=?
?f(?4,?4)=?

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