Question: Form the scalar products B C and B C, where B=B, and use the results obtained to prove the identity cos a cos

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


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


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

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