ভেক্টর রাশি-৩

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দুইটি ভেক্টরের স্কেলার গুণফল \(20\) একক এবং এদের ভেক্টর গুণফলের মাণ \(6\sqrt{2}\) একক। ভেক্টরদ্বয়ের মধ্যবর্তী কোণ কত?
[ কুয়েটঃভর্তিঃ ২০১৭-১৮ ]

\(30^{o}\)
\(22^{o}56^{\prime}\)
\(24^{o}2^{\prime}\)
\(22^{o}14^{\prime}\)
\(23^{o}58^{\prime}\)

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Ans: \(22^{o}56^{\prime}\)
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