$|\overrightarrow{\mathrm{A}} \cdot \overrightarrow{\mathrm{B}}|=|\overrightarrow{\mathrm{A}} \times \overrightarrow{\mathrm{B}}|^{}$ হলে $\overrightarrow{\mathbf{A}}$ ও $\overrightarrow{\mathbf{B}}$ এর মধ্যকার কোণ কত?

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