# cosd

Cosine of argument in degrees

## Description

example

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

## Examples

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### Cosine of 90 degrees compared to cosine of π/2 radians

```cosd(90) ```
```ans = 0 ```
```cos(pi/2) ```
```ans = 6.1232e-17```

### Cosine of complex angles specified in degrees

Create an array of three complex angles and compute the cosine.

```z = [180+i 45+2i 10+3i]; y = cosd(z)```
```y = -1.0002 0.7075 - 0.0247i 0.9862 - 0.0091i```

## 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 `cosd` operation is element-wise when `X` is nonscalar.

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

## Output Arguments

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

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

## See Also

#### Introduced before R2006a

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