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AC. F F F F 2 F F θ. F 2 F. F (Dot Product) ACAB. â . = AB AC cosθ. F. ACAB. â . = a1a2 +b1b2 a1,b1 a2,b2. F AB. AC. ACAB. â . = a1a2 +b1b2. F F. ACAB. â .