What is the Value of Sec pi? The value of sec pi is -1. Sec pi can also be expressed using the equivalent of the given angle (pi) in degrees (180°). Since the secant function is a periodic function, we can represent sec pi as, sec pi = sec(pi + n × 2pi), n ∈ Z.

The secant of x is 1 divided by the cosine of x: sec x = 1 cos x , and the cosecant of x is defined to be 1 divided by the sine of x: csc x = 1 sin x .

The secant-squared function, denoted. , can be defined in the following equivalent ways: It is the composite of the square function and the secant function (which in turn is the composite of the reciprocal function and the cosine function). It is the composite of the reciprocal function and the cosine-squared function.

There are three reciprocal trigonometric functions, making a total of six including cosine, sine, and tangent. The reciprocal cosine function is secant: sec(theta)=1/cos(theta). The reciprocal sine function is cosecant, csc(theta)=1/sin(theta).

cos x^{−}^{1}, sometimes interpreted as (cos(x))^{−}^{1} = 1cos(x) = sec(x) or secant of x, the multiplicative inverse (or reciprocal) of the trigonometric function cosine (see above for ambiguity)

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