(tanx+cotx)cos²x = (要过程)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/24 14:09:33
(tanx+cotx)cos²x = (要过程)
x){$1B;9b5eCs [܋e/?_ I*'I~ 6hUkUEm53*" }WaBT@!`Y& T$ف< 

(tanx+cotx)cos²x = (要过程)
(tanx+cotx)cos²x = (要过程)

(tanx+cotx)cos²x = (要过程)
(tanx+cotx)cos^2x
=(sinx/cosx+cosx/sinx)cos²x
=(sin²x+cos²x)*cos²x/(sinxcosx)
=1*cos²x/sinxcosx
=cosx/sinx
=cotx