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In a parallelogram ABC, vector,|AB| = a, |AD| = b and |AC| = c, then DA . AB has the value :

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In a parallelogram ABC, vector,|AB| = a, |AD| = b and |AC| = c, then DA . AB has the value :

(1)  1/2(a2 + b2 + c2)

(2)  1/2 (a2 - b2 + c2)

(3)  1/4 (a2 + b2 + c2)

(4) 1/2 (3a2 + b2 - c2)

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Correct option  (4) 1/2 (3a2 + b2 - c2)

Explanation:

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