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

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

sina cos B -D sin (a+ B) + }sin (a - в). .C B'

sina cos B -D sin (a+ B) + }sin (a - ). .C B'

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