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यदि $|\overrightarrow{\mathrm{a}}|=\sqrt{26},|\overrightarrow{\mathrm{b}}|=7$ और $|\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{b}}|=35$ तो $\overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{b}}=$