The trigonometric sine function.
xis a real or complex number
x is a real number,
sin(x) is the
y coordinate of the intersection of the unit circle
x^2 + y^2 = 1 and the ray from the origin making an angle
x (in radians) from the positive
x axis in the anticlockwise direction.
z is a complex number,
sin(z) is defined as
[e^(i⋅z) − e^(−i⋅z)]/(2⋅i).
If you want to specify the argument in degrees, you can use the ° postfix operator, which amounts to multiplication by π/180.
∫(sin(x), x, 0, π)