Question: The horizontal angle between two direction AB and AC, i.e. angleBAC, is measured with an uncertainty of 7.3. The bearing of line AB, i.e. Brg(AB),

The horizontal angle between two direction AB and AC, i.e. angleBAC, is measured with an uncertainty of ±7.3′′. The bearing of line AB, i.e. Brg(AB), was also measured with an uncertainty of ±2.5′′. A surveyor calculates the bearing of line AC as follows:

Brg(AC) = Brg(AB) - angleBAC

What is the standard deviation of the calculated bearing of line AC? Provide your answer in sexagesimal

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