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( degree ̊ )
X(Rad)
Y = tangent(X)
180 ̊
π
0
150 ̊
5π/6
-0.5773
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

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