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# What is Math.tanh() in Scala? Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.   The tanh() function returns the hyperbolic tangent of a number. To be more specific, it returns the hyperbolic tangent of a number in radians.

Figure 1 shows the mathematical representation of the tanh() function.

Figure 1: Mathematical representation of the hyperbolic tangent function

The scala.math._ header file is required for this function.

### Syntax

Double tanh(Double number)


### Parameter

This function requires a number that represents an angle in radians as a parameter.

You can use the following formula to convert degrees to radians.

radians = degrees * ( Pi / 180 )


### Return value

tanh() returns the hyperbolic tangent of a numberin radians that is sent as a parameter.

• If the parameter value is positive infinity, then it returns 1.
• If the parameter value is negative infinity, then it returns -1.
• If the parameter value is NaN, then it returns NaN.

### Example

import scala.math._object Main extends App {    //positive number in radians    println(s"The value of tanh(2.3) = ${tanh(2.3)}"); // negative number in radians println(s"The value of tanh(-2.3) =${tanh(-2.3)}");      //converting the degrees angle into radians and then applying tanh()    // degrees = 45.0    // PI = 3.14159265    // result first converts degrees to radians then apply tanh    println(s"The value of tanh(45.0) = ${tanh(45.0 * (Pi / 180.0))}"); //error outputs println(s"The value of tanh(Double.PositiveInfinity) =${tanh(Double.PositiveInfinity)}");    println(s"The value of tanh(Double.NegativeInfinity) = ${tanh(Double.NegativeInfinity)}"); println(s"The value of tanh(Double.NaN) =${tanh(Double.NaN)}");        }

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tangent
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CONTRIBUTOR Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.   Keep Exploring

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