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目前,涉及或其他倒数三角函数的输入的输出sec似乎以倒数形式返回表达式,例如:
sec
expand(integrate(6*sec(2*y)^7*tan(2*y)^3, y)); > 1/(3*cos(2*y)^9)\-3/(7*cos(2*y)^7)
有没有办法让这个返回sec(2*y)?我检查了显示文档和三角函数文档,但没有看到任何似乎可以解决此问题的内容。
sec(2*y)
看起来像trigreduce处理它(感谢 Stavros Macrakis 提供此信息)。
trigreduce
(%i2) 1/(3*cos(2*y)^9) - 3/(7*cos(2*y)^7); 1 3 (%o2) ----------- - ----------- 9 7 3 cos (2 y) 7 cos (2 y) (%i3) trigreduce(%); 9 7 sec (2 y) 3 sec (2 y) (%o3) --------- - ----------- 3 7