-> -->> u, v and w are three non-coplanar unit vectors and a, ß and y are the angles between u and v, v and w, → -> →→ and w and u, respectively, and x, y and z are unit vectors along the bisectors of the angles a, ß and y, →→ -> a respectively. Prove that [xxy yxz zxx]=_(u v wf sec² 16 2 22 se Y sec² 22/20 1 sec²

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