Question: Let u = (3i - 4j) /5 and v = (4i + 3j)/5 and suppose that at some point P, Du( = -6 and Dv(

Let u = (3i - 4j) /5 and v = (4i + 3j)/5 and suppose that at some point P, Du( = -6 and Dv( = -6 and Dv( = 17.
(a) Find (( at P.
(b) ((((((2 = (du()2 + (Dv()2 in part (a). Show that this relation always holds if u and v are perpendicular.

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