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The condition under which the vector (a+b) and (a-b) are parallel is

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The condition under which the vector (a+b) and (a-b) are parallel is
A. `abot b`
B. `|a|=|b|`
C. `a ne b`
D. `C=|A+B|`
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Correct Answer - D
(d) Their cross product shouldbe zero
`(a+B)xx(a-b)=0 `
`therefore 2(axxb)=0`
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