Higher Secondary Question Paper Solution of Year 2022 Question No: A.1.d(iii)

\(\vec{a} = 5\hat{i} - \hat{j} - 3\hat{k}\) এবং \(\vec{b} = \hat{i} + 3\hat{j} - 5\hat{k}\) হলে দেখাও যে \(\vec{a} + \vec{b} \)এবং \(\vec{a} - \vec{b}\) পরস্পর লম্ব ।

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