Sec-1, SEC-1, sec-1, or sec may refer to:
- sec x−1 = sec(x)−1 = exsec(x) or exsecant of x, an old trigonometric function
- secy = sec(y), sometimes interpreted as arcsec(y) or arcsecant of y, the compositional inverse of the trigonometric function secant (see below for ambiguity)
- secx = sec(x), sometimes interpreted as (sec(x)) = 1/sec(x) = cos(x) or cosine of x, the multiplicative inverse (or reciprocal) of the trigonometric function secant (see above for ambiguity)
- sec x, sometimes interpreted as sec(x) = sec(1/x), the secant of the multiplicative inverse (or reciprocal) of x (see below for ambiguity)
- secx, sometimes interpreted as (sec(x)) = 1/sec(x) = cos(x) or cosine of x, the multiplicative inverse (or reciprocal) of the trigonometric function secant (see above for ambiguity)
See also
- Second (time)
- Seconds of arc, a unit for angle measurement
- Inverse function
- cos (disambiguation)
- csc (disambiguation)
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