adj.分[交]割的，(横)切的
n.割线，正割

The secant of an angle in a right triangle is the ratio of the hypotenuse to the adjacent side.
直角三角形中，一个角的余割是斜边与邻边的比例。
In trigonometry, the secant function is the reciprocal of the cosine function.
在三角学中，余割函数是余弦函数的倒数。
The secant method is an iterative numerical method used to find roots of a real-valued function.
割线法是一种用于求实值函数零点的迭代数值方法。
As the angle approaches zero, the secant value tends to infinity.
当角度接近于零时，余割值趋向于无穷大。
The secant line on a graph represents an approximation of the tangent line for a given point.
图像上的割线对于给定点是对切线的一种近似表示。
In astronomy, the secant of the Sun's altitude can be used to calculate its distance from the observer.
在天文学中，太阳高度角的余割可以用来计算太阳与观测者之间的距离。
The secant of an arc in a circle is the length of the chord that intersects the arc, divided by the radius.
圆中的弧的余割是指与该弧相交的弦长除以半径的长度。
The derivative of the secant function is the product of the secant and cosecant functions multiplied by the tangent.
余割函数的导数等于原函数的余割乘以余弦的倒数再乘以正切。
When computing the secant of an obtuse angle, it yields a negative result since the adjacent side becomes the opposite one.
计算钝角的余割时，由于邻边变成了对边，结果为负值。
In calculus, the limit of the difference quotient for the secant approaches the derivative as the change in x approaches zero.
在微积分中，随着x的变化趋近于零，割线差商的极限就等于函数的导数。