secd

secd(x)

Compute the secant of `x`, where `x` is in degrees

Examples

In the Julia programming language, the `secd()` function computes the secant of `x` when `x` is given in degrees.

``````julia> secd(45)
1.4142135623730951``````

Here are some common examples of using the `secd()` function:

1. Calculate the secant of an angle in degrees:

``````julia> secd(60)
2.0000000000000004``````

This example calculates the secant of 60 degrees.

2. Compute the secant of multiple angles in degrees:

``````julia> angles = [30, 45, 60];
julia> secants = map(secd, angles)
3-element Array{Float64,1}:
1.1547005383792515
1.4142135623730951
2.0000000000000004``````

It calculates the secant for each angle in the given array.

Common mistake example:

``````julia> secd(90)
-1.995200412208242``````

In this example, the secant of 90 degrees is expected to be 1, but the function returns a negative value. This is because the secant function is periodic, and the input angle of 90 degrees corresponds to a vertical asymptote. When working with trigonometric functions, it's important to be aware of their periodicity and the domain restrictions to avoid unexpected results.