[See Solution] Find the directional derivative of the function at P, in the direction Q : f(x,y)= cos (x+y), P=(0,π), Q=(π
Question: Find the directional derivative of the function at P, in the direction Q :
\[f\left( x,y \right)=\cos \left( x+y \right),\,\,\,P=\left( 0,\pi \right),\,\,Q=\left( \pi /2,0 \right)\]
Deliverable: Word Document 
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