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