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What is the angle between A = $5 (\hat{i} - \hat{j})$ and B = $5 (\hat{i} - \hat{j})$ ?

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Correct option is C

A→⋅B→=|A→||B→|cos⁡θHere|A→|=(5)2+(5)2=52|B→|=(5)2+(5)2=52∴(5i^−5j^)⋅(5i^−5j^)=52×52cos⁡θ5×5+5×5=25×2cos⁡θ∴cos⁡θ=1 or θ=0∘

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What is the angle between A = 5(i^-j^) and B = 5(i^-j^)?

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What is the angle between A = $5 (\hat{i} - \hat{j})$ and B = $5 (\hat{i} - \hat{j})$ ?