论文部分内容阅读
已知三角函数值求和、差、倍、半角是三角计算中的一种常见问题.解题时往往因对所求角的范围考虑不周而造成多解或漏解.如果我
Known trigonometric function sums, differences, times, and half-angles are a common problem in trigonometric calculations. When solving a problem, multiple solutions or missing solutions are often caused by poor consideration of the range of angles sought.