Which of the following identities is not valid? (a) a(b + c) = ab + bc (b)

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Which of the following identities is not valid?

(a) a(b + c) = ab + bc 

(b) a × (b + c) = a × b + a × c 

(c) a ∙ b = b ∙ a

(d) c ∙ (a × b) = –b ∙ (a × c)

(e) a∙ a= cos θAB

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