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Vectors A, B and C form a triangle. The angle between A and B is [tex]\theta[/tex] and the vectors are related by C=A-B. Compute C . C in terms of the magnitudes A, B and the angle [tex]\theta[/tex] and derive the law of cosines [tex]C^2 = A^2 + B^2 - 2AB cos \theta [/tex].

I have no idea what C . C means but I asked and the lecturer said it was the dot product or something along those lines. Any help would be appreciated

I have no idea what C . C means but I asked and the lecturer said it was the dot product or something along those lines. Any help would be appreciated

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