# cotd

Cotangent of argument in degrees

## Description

example

````Y = cotd(X)` returns the cotangent of the elements of `X`, which are expressed in degrees.```

## Examples

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### Cotangent of angles approaching 90 and 180 degrees

Create a vector of input angles consisting of 90° and the next smaller and larger double precision numbers. Then compute the cotangent.

```x1 = [90-eps(90) 90 90+eps(90)]; y1 = cotd(x1)```
```y1 = 1.0e-15 * 0.2480 0 -0.2480```

`cotd` returns zero when the input angle is exactly 90°. Evaluation at the next smaller double-precision angle returns a slightly positive result. Likewise, the cotangent is slightly negative when the input angle is the next double-precision number larger than 90.

The behavior is similar for input angles near 180°.

```x2 = [180-eps(180) 180 180+eps(180)]; y2 = cotd(x2)```
```y2 = 1.0e+15 * -2.0159 Inf 2.0159```

### Cotangent of complex angle, specified in degrees

```x = 35+5i; y = cotd(x) ```
```y = 1.3958 - 0.2606i```

## Input Arguments

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### `X` — Angle in degreesscalar value | vector | matrix | N-D array

Angle in degrees, specified as a real-valued or complex-valued scalar, vector, matrix, or N-D array. The `cotd` operation is element-wise when `X` is nonscalar.

Data Types: `single` | `double`
Complex Number Support: Yes

## Output Arguments

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### `Y` — Cotangent of anglescalar value | vector | matrix | N-D array

Cotangent of angle, returned as a real-valued or complex-valued scalar, vector, matrix, or N-D array of the same size as `X`.