原式=sin(180º-α)/tan(180º+α)]·cot(-α)]/tan(180º-α)·cos(-α)/sin(-α)
=sinα/tanα·(-cotα)/(-tanα)·cosα/(-sinα)
=sinα·(cosα/sinα)·cot²α·(-cotα)
=-cosα·cot³α
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
sin(540-α)/tan(α-180)*cot(-α-360)/tan(900-α)*cos(720-α)/sin(-α-360)
数学人气:319 ℃时间:2019-10-09 12:09:42
优质解答
我来回答
类似推荐
猜你喜欢
- 1what about going fishing with me?等于什么
- 2x+3+3.7x=17.1(快!方程)
- 3We mustn't play football in the street.(保持原句意思) ____ football is not _____in the street.
- 4向含盐15%的100克盐水里再加入5克盐,这时盐与水质量的最简比是( )
- 5某单原子理想气体经历一准静态过程,压强p=c/T,c为常数,试求此过程中该气体的摩尔热容.
- 6初一英语连词成句 1、some people young online shopping like
- 7弧AB 弧CD 中点 EF APQ是什么三角形 圆
- 8Lucy and Lily____China next week.A is visit B are visiting C visit D visits
- 9英语单词适当形式填空
- 10成为一名记者是我梦想中的工作 英语翻译