# cotd

cotd(x)

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

## Examples

In the Julia programming language, the function `cotd(x)` computes the cotangent of `x` where `x` is in degrees.

``````julia> cotd(45)
0.6173696237835552``````
1. Calculate the cotangent of an angle in degrees:

``````julia> cotd(30)
0.5773502691896257``````

This example calculates the cotangent of 30 degrees.

2. Evaluate the cotangent of multiple angles:

``````julia> angles = [45, 60, 90];
julia> cotd.(angles)
3-element Array{Float64,1}:
1.0
0.5773502691896257
0.0``````

It computes the cotangent of each angle in the given array.

3. Use cotd in mathematical expressions:
``````julia> x = 30;
julia> y = cotd(x) + 2 * cotd(2 * x);
julia> y
0.473606797749979``````

It demonstrates the usage of `cotd` within a mathematical expression.

Common mistake example:

``````julia> cotd("60")
ERROR: MethodError: no method matching cotd(::String)``````

In this example, the function `cotd` is called with a string argument `"60"`. The correct usage is to provide a numeric value representing an angle in degrees. Make sure to pass a valid numeric argument to `cotd` to avoid such errors.