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3. Suppose S is an orientable surface with a parametrization o: U Vns, that f= F = 0 at all points in V. Show

3. Suppose S is an orientable surface with a parametrization o: U + VAS, that f = F = 0 at all points in V. Show that ou and

3. Suppose S is an orientable surface with a parametrization o: U Vns, that f= F = 0 at all points in V. Show that ou and o, are principal directions at all points in V.

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