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(a) (1, 1, 1, 1)
(b)
(c)

     In each part, an orthonormal basis relative to the Euclidean inner product is given. Use Theorem 6.3.1 to find the
11. coordinate vector of w with respect to that basis.

(a)                 ,
                 ;

(b) ; , ,

12. Let  have the Euclidean inner product, and let         be the orthonormal basis with     ,
               .

(a) Find the vectors u and v that have coordinate vectors                 and             .

(b) Compute ,       , and by applying Theorem 6.3.2 to the coordinate vectors                and ; then check

         the results by performing the computations directly on u and v.

13. Let  have the Euclidean inner product, and let         be the orthonormal basis with                                 ,
                 , and .

(a) Find the vectors u, v, and w that have the coordinate vectors , , and
                            .

(b) Compute ,       , and by applying Theorem 6.3.2 to the coordinate vectors , , and ;

         then check the results by performing the computations directly on u, v, and w.
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