Question: In surveying, when determining an azimuth (a measure used for reference purposes), it might be necessary to simplify the expression (2cos cos ) 1

In surveying, when determining an azimuth (a measure used for reference purposes), it might be necessary to simplify the expression (2cos αcos β)⁻¹ − tan α tan β. Perform this operation by expressing it in the simplest possible form when α = β.

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