Question: 1 . Let A , B , C in E 3 . Use geometrical arguments to show the following identities ( where a , b

1. Let A, B, C in E3. Use geometrical arguments to show the following identities (where a, b in R).
(a)(A + B)+ C = A +(B + C);
(b)(a + b)A = aA + bA;
(c) a(A + B)= aA + aB

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