早教吧 育儿知识 作业答案 考试题库 百科 知识分享

化简(5-cos20°)/(3-cos^210°)

题目详情
化简(5-cos20°)/(3-cos^2 10°)
▼优质解答
答案和解析
(5-cos20°)/(3-cos^2 10°)
=2*(5-cos20°)/(6-2cos^2 10°)
=2*(5-cos20°)/(5-cos20°)
=2