PHP sin()

PHP sin(x) function returns the sine value of radian angle x. The principle values for x is [-,].

<?PHP
	echo sin(M_PI); //1.2246467991474E-16
	echo sin(M_PI/2);  //1
?>

deg2rad() function can be used to convert degree to radian angle.

<?PHP
	echo sin(deg2rad(60));  //0.86602540378444
	echo sin(deg2rad(30));  //0.5
?>

Sine y=sin(x) Graph

X( degree ̊ )
X(Rad)
Y = Sine(X)
180 ̊
π
0
150 ̊
5π/6
0.5
135 ̊
3π/4
0.707107
120 ̊
2π/3
0.866025
90 ̊
π/2
1
60 ̊
π/3
0.866025
45 ̊
π/4
0.707107
30 ̊
π/6
0.5
0 ̊
0
0
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