Suppose that g is a function of two independent variables that has continuous partial derivatives, and consider the points P(8,6), Q(7,6), R(8,18) and S(6,7). The directional derivative of g at P in the direction of the vector PQ→ is 4, whilst the directional derivative of g at P in the direction of PR→ is 4.   Find the directional derivative of g at P in the direction of the vector PS→. Give your answer correct to 2 decimal places.   DPS→g(P)=

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