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

1.	The condition under which the vector (a+b) and (a-b) are parallel is
Answer» `abot b` `\|a\|=\|b\|` `a ne b` `C=\|A+B\|` SOLUTION :(d) Their cross product SHOULDBE zero `(a+B)xx(a-b)=0 ` `therefore 2(AXXB)=0`

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