Higher Secondary Question Paper Solution of Year 2019 Question No: 1.(d)(ii)

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

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