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What about sine and cosine function? 了解正弦和馀弦函数？
The inverse function of that restricted cosine function is called the arccosine function. 被限定的余弦函数之反函数叫做反余弦函数。
With the use of the properties of the second Chebyshev polynomial,a group of interesting identity of sine and cosine function is obtained. 利用第二类契贝谢夫多项式的性质得到了关于正余弦函数的一组有趣的恒等式。
When the input power is smaller than the critical power, the beam width takes quasi-periodical diffraction with the Jacobian elliptic sine and elliptic cosine functions. 当光束初始功率小于临界功率时，光束束宽则按雅可比椭圆正弦函数和椭圆余弦函数作准周期展宽变化；
In this paper, a novel construction of bivariate orthogonal compactly supported wavelet filter based on the cosine function is proposed. 摘要本文提出了一种基于余弦函数的二元紧支撑正交小波滤波器的构造方法。
Previous studies have shown that the MDCT analysis results of pure sinusoids can be approximated by using the product of a constant, a cosine function, and a decay function. 由先前的研究，一个正弦波讯号的修正式离散馀弦转换分析结果可以由一个常数，一个馀弦函数与一个衰减函数的乘积所逼近。
Y. Zhu, L. Zhong, X. Lv, Y. Luo and C. She, “A novel phase unwrapping method based on cosine function,” Proceedings of SPIE, Vol. 5633, pp.383-392, 2005. 赖皇文，创新型即时同步相移干涉式三维轮廓量测仪，硕士论文，国立台北科技大学自动化科技研究所，台北，2007。
This paper develops iterative formula of sine and cosine function in document[40], and presents new pixel-level algorithms forgenerating Archimedes and involute curves which are widely used in engineering. 本文推广了文献[40]中正弦、余弦函数的递推公式，对工程绘图中常用的阿基米德曲线和渐开线设计了新的逐点生成算法。
In order to discuss the rationality of various warping displacement modes, second-degree parabola, cubic parabola, fourth-degree parabola and cosine function are selected respectively. 为了探讨各种剪滞翘曲位移模式的合理性，分别选取二次抛物线、三次抛物线、四次抛物线及余弦函数等翘曲位移模式进行计算；
On some identities of sine and cosine functions 关于正弦函数和余弦函数的一些恒等式
n - times integrated e cosine functions n次积分c余弦函数
On A Group of Identical Equation of Cosine Function 关于余弦函数的一组恒等式
Symmetry of Sine and Cosine Function Graphs 正弦函数图像及余弦函数图像的对称性
On a group of identity of sine and cosine function 关于正、余弦函数的一组恒等式
Loosely, a mathematical or logic operator. 不严格地说，一种数学或逻辑运算符。
That store operator ripped me off. 那个商店的营业员把我骗了。
The operator told the caller that the line is busy. 接线生告诉打电话的人对方电话占线。
Ring the operator and ask for Freefone 8921. 接通接线生，然後要免费通话8921号。
The intricate machine requires a skilled operator. 这种复杂精细的机器须由技能熟练的人操作。
The cos() function returns the cosine of a number. 函数的作用是：返回一个数值的余弦值。