Math Trigonometric functions TAN() to get TAN value of any radian as input in PHP

Calculate the tangent of an angle

tan() expects the angle in radians and returns its tangent. Values close to angles where tangent is undefined can become extremely large because of floating-point approximation.

$angle = deg2rad(45);
echo tan($angle); // approximately 1

Start with this current pattern. The examples below are retained for additional variations, output and reference.

TAN(X);

X is the angular value in radian. We get output as TANGENT of the input value.

<?Php
echo TAN(PI()); // Output is  0 
echo "<br>";
echo TAN(PI()/2); // Output  is infinity 
echo "<br>";
echo ROUND(TAN(PI()/3),2); // Output is 1.73
echo "<br>";
echo TAN(PI()/4); // Output is 1 
?>

deg2rad() with TAN()

We can use deg2rad() to convert Degree value to radian and then use TAN().

<?Php
echo TAN(deg2rad(0)); // Output  is 0
echo "<br>";
echo TAN(deg2rad(90)); // Output is 1.6331239353195E+16  // same as infinity 
echo "<br>";
echo TAN(deg2rad(180)); // Output  is -1.2246467991474E-16//  same as 0
?>

Example: Handling Tan of 90 Degrees

$angle = 90;
echo tan(deg2rad($angle));  // Output: Large value (Infinity)

Example: Calculating Slope of a Triangle

$angle = 45;
$adjacent = 10;
$opposite = $adjacent * tan(deg2rad($angle));  // Output: 10 (Height of the triangle)
echo $opposite;

Example: Calculating Tan for Small Angles

$angle = 30;
echo tan(deg2rad($angle));  // Output: 0.57735026918963

Example: Tan of Negative Angles

$angle = -45;
echo tan(deg2rad($angle));  // Output: -1

Example: Using Tan to Find Height from Distance and Angle

$angle = 30;  // Angle of elevation
$distance = 100;  // Distance from object
$height = $distance * tan(deg2rad($angle));  // Calculate height
echo $height;  // Output: 57.735026918963

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

SIN() COS() rad2deg() function

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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