Question: Leta,bR 2 , andc = ba . Byconsidering | c | 2 , showthatc 2 = a 2 + b 2 2 ab cos where

Leta,bR2,andc=ba. Byconsidering|c|2,showthatc2= a2+ b22ab cos where a =|a|, b =|b|, c =|c|, and is the angle between a and b.

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