n.牛蒡因，牛蒡子苷，牛蒡甙，牛蒡子甙

The arctangent of 0.5 is approximately 0.4636.
反正切值大约是0.4636。
In trigonometry, arctan is used to find the angle whose tangent is a given number.
在三角学中，反正切用于找出其正切值为给定数的角。
The arctangent function is the inverse of the tangent function, denoted as tan^(-1).
反正切函数是正切函数的逆，通常表示为tan^-1。
If you take the arctangent of -1, you get an angle of -π/4 radians.
如果你取-1的反正切，你会得到一个角度为-π/4弧度。
In a right triangle, the arctangent of the opposite side over the adjacent side equals the angle in standard position.
在直角三角形中，对边与邻边的比例等于标准位置的角度。
The calculator displays both the sine and arctangent values simultaneously for ease of comparison.
计算器同时显示正弦和反正切值，便于比较。
When solving a system of equations, you might need to find the arctangent of a quotient to determine one of the angles.
解决方程组时，可能需要求出商的反正切来确定其中一个角。
In physics, the arctangent appears when calculating the angle between a magnetic field and a current-carrying wire.
在物理学中，当计算磁场与带电导线之间的夹角时，会用到反正切。
The arctangent is useful in understanding the direction of a vector in a two-dimensional plane.
反正切有助于理解二维平面上向量的方向。
The arctangent function is widely used in computer graphics for creating smooth rotations and animations.
反正切函数在计算机图形学中被广泛用于创建平滑的旋转和动画效果。