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Condition under which vectors (a + b) and (a $-$ b) are parallel is

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a⊥b

a = b

a≠b

a is parallel to b

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detailed solution

Correct option is D

Their cross product should be zero.(a+b)×(a-b)=0∴ 2(a×b)=0So, a is parallel to b.

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Condition under which vectors (a + b) and (a - b) are parallel is

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Condition under which vectors (a + b) and (a $-$ b) are parallel is