ভেক্টর রাশি-২

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\(|\vec{A}\times{\vec{B}}|=\vec{A}.\vec{B}\) হলে এদের মধ্যবর্তী কোণ কত?
[ দিঃ ২০১৬, জাহাঃবিঃভর্তিঃ ২০১৬-১৭, রাঃবিঃভর্তিঃ ২০১৪-১৫ ]

\(\frac{\pi}{4}\)
\(\frac{\pi}{2}\)
\(\pi\)
\(2\pi\)
উপরের কোনোটিই নয়

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Ans: \(\frac{\pi}{4}\)
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