Question: Form the vector products B x C and B' x C, where B = B', and use the results obtained to prove the identity a

Form the vector products B x C and B' x C, where B = B', and use the results obtained to prove the identity

a cos = sin (a + B) + sin (a - B).

%3D 
 

a cos = sin (a + B) + sin (a - B). %3D

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