The **`tanh()` function** in R returns a number's hyperbolic tangent in radians. 

The following illustration shows the mathematical representation of the `tanh()` function.

#   
#  Syntax
```r
tanh(num)
```
#   
#  Parameter
This function requires a number that represents an angle in radians as a parameter.

To convert degrees to radians, use:
```r
radians = degrees * ( PI / 180.0 )
```

##  
## Return value
`tanh()` returns the hyperbolic tangent of a number (in radians) that is set as a parameter.

##  
## Code


#positive number in radians
a <- tanh(2.3);
print(paste0("tanh(2.3): ", a))

#negative number in radians
b <- tanh(-2.3);
print(paste0("tanh(-2.3): ", b))

#converting the degrees angle into radians and then applying tanh()
#degrees = 45
c <- tanh(45 * (pi / (180)));
print(paste0("tanh(45 * (pi / (180))): ", c))

What is tanh() in R?

The tanh() function in R returns the hyperbolic tangent of a number in radians.