ভেক্টর রাশি-৩

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\(|\vec{A}+\vec{B}|=|\vec{A}-\vec{B}|\) হলে \(\vec{A}\) ও \(\vec{B}\) এর মধ্যবর্তী কোণ হবে -
[ দিঃ ২০১৭, জাহাঃবিঃভর্তিঃ ২০১৫-১৬ ]

\(0^{o}\)
\(90^{o}\)
\(45^{o}\)
\(180^{o}\)
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Ans: \(90^{o}\)
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