The **cosh()** function in R is **“used to calculate the hyperbolic cosine of a number in radians“**. It accepts the numerical value as an argument and returns the hyper tangent of the cosine of that numeric value.

**Syntax**

`cosh(x)`

**Parameters**

**x**: It is a column to calculate.

**Return value**

The cosh() function returns the hyperbolic cosine of a number (in radians) sent in as a parameter.

**Example 1: R program to use the cosh() function**

Let’s calculate the cosh value of 1.

`cosh(1)`

**Output**

`[1] 1.543081`

Let’s calculate the cosh value of 0.

`cosh(0)`

**Output**

`[1] 1`

**Example 2: Using the cosh() function with a complex number**

Define a complex value and pass that value to the cosh() function.

```
d <- 5 + 1i
cosh(d)
```

**Output**

`[1] 40.09581+62.43985i`

**Example 3: Using the cosh() function with a Vector**

To create a Vector in R, you can use the c() function. Then pass that vector to the cosh() function.

```
rv <- c(-1, 0.5, 0, 0.5, 1)
cosh(rv)
```

**Output**

`[1] 1.543081 1.127626 1.000000 1.127626 1.543081`

**Example 4: Passing a pi to the cosh() function**

The **pi **is an inbuilt constant in R programming, and its value is **3.141593**.

Let’s find the pi constant’s **cosh()** value.

`cosh(pi)`

**Output**

`[1] 11.59195`

Let’s see another example of **pi**.

`cosh(pi / 4)`

**Output**

`[1] 1.324609`

**Plotting the cosh() function to a graph**

We can use the seq() function to create a series of values and pass that to the plot() function, creating a line chart.

```
dt <- seq(-1, 1, by = 0.05)
plot(dt, cosh(dt), typ = "l", col = "red")
abline(v = 0, lty = 6, col = "blue")
```

**Output**

That’s it.

Krunal Lathiya is a Software Engineer with over eight years of experience. He has developed a strong foundation in computer science principles and a passion for problem-solving. In addition, Krunal has excellent knowledge of Data Science and Machine Learning, and he is an expert in R Language.