cosh(): Hyperbolic cosine

float cosh(float X);

<?Php
echo cosh(0); // Output is 1
echo "<br>";
echo cosh(1); // Output  1.5430806348152
echo "<br>";
echo cosh(-1); // Output 1.5430806348152
echo "<br>";
echo cosh(4.2); // Output is 33.350663308873
echo "<br>";
echo cosh(2); // Output is 3.7621956910836
echo "<br>";
echo cosh(90); // Output is 6.1020164715892E+38
?>

Example 1: Using cosh() with Small Negative Numbers

<?php
echo cosh(-0.5);  // Output: 1.1276259652064
?>

Example 2: Calculating Hyperbolic Cosine of Large Numbers

<?php
echo cosh(100);  // Output: A very large number: 1.3440585709081E+43
?>

Example 3: Hyperbolic Cosine in a Real-World Scenario

<?php
// Simulating the shape of a hanging cable (catenary)
$distance = 1.5;
echo cosh($distance);  // Output: 2.3524096152432
?>