What is tanh() in Perl?

The tanh() function in Perl returns a number’s hyperbolic tangent in radians.

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

Mathematical representation of the hyperbolic tangent function

Syntax

tanh(num)

Parameter

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

To convert degrees to radians, use the following function in Perl.

deg2rad(angleInDegrees)

Return value

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

  • If the value of num is NaNnot a number, then the returned value is NaN.
  • If the value of num is positive infinity, then the returned value is 1.
  • If the value of num is negative infinity, then the returned value is -1.

Code

#this header for deg2rad() function
use Math::Trig;
#Positive number in radians
$a = tanh(2.3);
print "tanh(2.3): $a \n";
#negative number in radians
$b = tanh(-2.3);
print "tanh(-2.3): $b \n";
#converting the degrees angle into radians and then applying tanh()
#degrees = 45
$rad = deg2rad(45);
$c = tanh($rad);
print "tanh($rad): $c \n";
#Inf values
$d = tanh(Inf);
print "tanh(Inf): $d \n";
$e = tanh(-Inf);
print "tanh(-Inf): $e \n";
#NaN value
$f = tanh(NaN);
print "tanh(NaN): $f \n";

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