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**Hint:**This problem is easy once we find the definition of sec. A secant of a curve is a line that intersects the curve at least two distinct points in geometry. Secant is derived from the Latin word secare, which means "to cut." A secant can intersect a circle at exactly two points in the case of a circle.

**Complete step by step solution:**

\[\sec = \dfrac{1}{{\cos }}\]

Let's start by converting to degrees from radians. The conversion for radians to degrees

\[\dfrac{{180}}{\pi }\].

\[

\dfrac{{180}}{\pi } \times \left( { - \dfrac{\pi }{3}} \right) \\

= \left( { - {{60}^\circ }} \right) \\

\]

To make this a positive angle, we must subtract 60 from 360, giving us \[{300^\circ }\] .

This is a unique perspective because it provides us with a precise response. However, we must first determine the reference angle before adding our special triangle. A reference angle is the angle between the terminal side of \[\theta \] to the x axis . It should always satisfy the interval \[{0^\circ } \leqslant \beta < {90^\circ }\] . The nearest x axis interception of \[{300^\circ }\] is at \[{360^\circ }\] . After subtracting, we arrive at a reference angle of \[{60^\circ }\] . We use the \[30 - 60 - 90\] , 1 , \[\sqrt 3 \] , 2 .

Since 60 is greater than 30 , and \[{60^\circ }\] is the reference angle , this indicates that the side opposite our reference angle has been measured \[\sqrt 3 \] . The hypotenuse is always the longest, with a length of 2. As a result, we can deduce that the adjacent side is 1.

Applying the definition of cos:

adjacent/hypotenuse \[ = \] \[ - \dfrac{1}{2}\] (cos is negative in quadrant IV)

Substituting into sec .

1/(adjacent/hypotenuse) \[ = \] hypotenuse/adjacent \[ = - 2\]

**Therefore, \[\sec \left( { - \dfrac{\pi }{3}} \right) = - 2\].**

**Note:**

Sine, cosine, and tangent are the three most common trigonometric ratios. However, even though they are rarely used, there are three additional ratios: secant, cosecant, and cotangent. Since they can be conveniently calculated using the three key ratios, most calculators don't even have a button for them.

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