a. Prove the triple product identity Ax(BxC)= B(AC)-C(A.B).

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a. Prove the triple product identity
Ax(B×C)= B(A·C)-C(A·B).
Begin by adopting a Cartesian coordinate system. Without loss of generality, you
may orient your coordinate system such that the x axis is along B, so that
B = Bi. You then have the freedom to place the y axis in the plane defined by B
and C. (But wait- what happens if B and C point in the same direction, so that
no such plane is defined?) Very Strong Hint: I did this in class. Look in the book!
Transcribed Image Text:a. Prove the triple product identity Ax(B×C)= B(A·C)-C(A·B). Begin by adopting a Cartesian coordinate system. Without loss of generality, you may orient your coordinate system such that the x axis is along B, so that B = Bi. You then have the freedom to place the y axis in the plane defined by B and C. (But wait- what happens if B and C point in the same direction, so that no such plane is defined?) Very Strong Hint: I did this in class. Look in the book!
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