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If $A = \hat{i} + \hat{j} + \hat{k}$ and $B = - \hat{i} - \hat{j} - \hat{k}$ , then what is the angle made by (A - B) with A?

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detailed solution

Correct option is A

A-B=(i^+j^+k^)-(-i^-j^-k^)=2i^+2j^+2k^=2Ai.e. A - B and A are parallel.Hence, θ = 0°

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If A=i^+j^+k^ and B=-i^-j^-k^, then what is the angle made by (A - B) with A?

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If $A = \hat{i} + \hat{j} + \hat{k}$ and $B = - \hat{i} - \hat{j} - \hat{k}$ , then what is the angle made by (A - B) with A?