Sarthaks Test
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For two vectors A and B, A+B = A-B is always true when

(a) |A| = |B | 0

(b) B

(c) |A |= |B| ≠ 0 and A and B are parallel or anti parallel

(d) when either |A | or |B| or is zero.

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(b) A  B

(d) when either |A | or |B| or is zero.

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