COS(): cosine of the num parameter

<?Php
echo COS(PI()); // Output is -1
echo "<br>";
echo COS(PI()/2); // Output  6.1232339957368E-17 // Same as 0 
echo "<br>";
echo COS(PI()/3); // Output is 0.5
echo "<br>";
echo COS(PI()/4); // Output is 0.70710678118655 
?>

COS(X);

deg2rad() with COS()

<?Php
echo cos(deg2rad(0)); // Output  is 1
echo "<br>";
echo cos(deg2rad(180)); // Output  is -1
?>

Example: Cosine of Large Values

echo cos(100000);  // Output: 0.9367521275331447

Example: Cosine in Physics (Force Calculation)

$angle = deg2rad(60);  // Convert degrees to radians
$force = 100;
echo $force * cos($angle);  // Output: 50 (Force in the x-direction)

Example: Cosine of 0 Degrees

$angle = 0;
echo cos(deg2rad($angle));  // Output: 1

Example: Cosine of 90 Degrees

$angle = 90;
echo cos(deg2rad($angle));  // Output: 6.1232339957368E-17 (close to 0)

Example: Calculating Cosine for Negative Angles

$angle = -45;
echo cos(deg2rad($angle));  // Output: 0.70710678118655

Plotting of SIN & COS curves by using PHP GD function with deg2rad()

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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