Form the scalar products B C and B C, where B=B, and use the results
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Form the scalar products B ⋅ C and B′ ⋅ C, where B=B′, and use the results obtained to prove the identity
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cos a cos ß = cos(a + B) +cos (a - B). %3D
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9 LI x aB B B X By definition where or By definition BC BC cosa B Bcos Bi si...View the full answer
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