ভেক্টর রাশি-৪

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\(\hat{i}-\hat{j}\) এবং \(\hat{i}+\hat{k}\) এর মধ্যবর্তী কোণ কত?
\(30^{o}\)
\(60^{o}\)
\(90^{o}\)
\(180^{o}\)
উপরের কোনোটিই নয়

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Ans: \(60^{o}\)
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