- #1
Cpt Qwark
- 45
- 1
Homework Statement
For [tex]f(x,y)=x^2-xy+y^2[/tex] and the vector [tex]u=i+j[/tex].
ii)Find two unit vectors such [tex]D_vf=0[/tex]
Homework Equations
N/A.
The Attempt at a Solution
Not sure if relevant but the previous questions were asking for the unit vector u - which I got [tex]\hat{u}=\frac{1}{\sqrt{2}}(i+j)[/tex] for the maximum value of [tex]D_uf[/tex] which was [tex]\sqrt{2}[/tex].