ভেক্টর রাশি-৪

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\(\vec{P}\) ও \(\vec{Q}\) এর মধ্যবর্তী কোণ \(\theta\) এবং \(|\vec{P}+\vec{Q}|=|\vec{P}-\vec{Q}|\) হলে \(\theta\) এর মাণ কত?
[ রাঃ ২০১৫]

\(0^{o}\)
\(45^{o}\)
\(90^{o}\)
\(180^{o}\)
উপরের কোনোটিই নয়

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Ans: \(90^{o}\)
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