作业帮化简cos(x-兀)/sin(兀-x) xsin(x-2兀)Xcos(2兀-x)求过程!
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/19 16:08:24
化简cos(x-兀)/sin(兀-x) xsin(x-2兀)Xcos(2兀-x)求过程!
化简cos(x-兀)/sin(兀-x) xsin(x-2兀)Xcos(2兀-x)求过程!
化简cos(x-兀)/sin(兀-x) xsin(x-2兀)Xcos(2兀-x)求过程!
由cos(x-丌)=-cosx,sin(丌-x)=sinx,sin（x-2丌）=-sinx,cos(2丌-x)=cosx得,cos（x-丌）/sin（丌-x)*sin（x-2丌）cos(2丌-x)=-cosx/sinx*sinxcosx=-cosx^2.
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