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Question

2 \hat{i} - \hat{j} + 2 \hat{k}

ভেক্টরটির সাথে X-অক্ষ যে কোণ উৎপন্ন করে তা কত?

\cos^{- 1} (- \frac{1}{2})

\cos^{- 1} (\frac{2}{3})

\cos^{- 1} (\frac{1}{2})

\cos^{- 1} (\frac{- 2}{3})

ANS : 2

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