Campus Livre
sec
Secant of an angle in radians, 1/cos(x).
Category: Mathematics > Elementary Math
Syntax
Y = sec(X)Returns 1./cos(X) for each element of X, with X in radians.
Description
The secant is the reciprocal of the cosine, so it has vertical asymptotes where the cosine vanishes, at odd multiples of pi/2. Because pi/2 is not represented exactly, sec(pi/2) gives a huge number rather than Inf.
For angles in degrees use secd; the hyperbolic counterpart is sech.
Input arguments
X- Angles in radians; real or complex.
Output arguments
Y- Array of the same size as
X, with absolute value at least 1 for real input.
Example
Values at common angles
sec([0 pi/3 pi])
sec(pi/2)Output
ans = 1×3
1.0000 2.0000 -1.0000
ans = 1.6331e+16