arcsec (arc secant)
The inverse of the secant function. Also written arc-secant, arcsecx, asec, or sec-1. The value of the arcsec function of any argument is an angle in radians whose secant function equals the given argument, that is, y = sec-1x if and only if x = sec(y) for 0 < y < symbol PI and y symbol not equal symbol PI/2.

Related Terms: secant (sec), inverse trigonometric functions

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