PHP tan()


PHP tan(x) function calculates the tangent value of radian angle x.

<?PHP
	echo tan(M_PI);  //-1.2246467991474E-16
	echo tan(M_PI/2);  //1.6331239353195E+16
	echo tan(M_PI/4);  //1
?>

deg2rad() function can be used to convert degree to radian angle.
<?PHP
	echo tan(deg2rad(180));  //-1.2246467991474E-16
	echo tan(deg2rad(90));  //1.6331239353195E+16
	echo tan(deg2rad(45));  //1
?>

Tangent y=tan(x) Graph
X
(deg)
X
(Rad)
tangent(X)
180 ̊ π 0
150 ̊ 5π/6 -0.57735
135 ̊ 3π/4 -1
120 ̊ 2π/3 -1.732051
90 ̊ π/2 Out of Range
60 ̊ π/3 1.732051
45 ̊ π/4 1
30 ̊ π/6 0.57735
0 ̊ 0 0