The term sec^{-1} refers to the inverse secant function, which is the function that gives the angle whose secant is a given value. It is defined as the angle θ such that $$ ext{sec}( heta) = x$$, where x is a real number greater than or equal to 1 or less than or equal to -1. Understanding this function is essential for solving trigonometric equations involving secant and helps in finding the angles associated with specific secant values.
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