Sec-1, SEC-1, sec-1, or sec−1 may refer to:
sec x−1 = sec(x)−1 = exsec(x) or exsecant of x, an old trigonometric function
sec−1y = sec−1(y), sometimes interpreted as arcsec(y) or arcsecant of y, the compositional inverse of the trigonometric function secant (see below for ambiguity)
sec−1x = sec−1(x), sometimes interpreted as (sec(x))−1 = 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−1, sometimes interpreted as sec(x−1) = sec(1/x), the secant of the multiplicative inverse (or reciprocal) of x (see below for ambiguity)
secx−1, sometimes interpreted as (sec(x))−1 = 1/sec(x) = cos(x) or cosine of x, the multiplicative inverse (or reciprocal) of the trigonometric function secant (see above for ambiguity)
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