化简:cos(a-π/2)/sin(5π/2+a)*sin(a-2π)*cos(2π-a)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/06 05:26:31

化简:cos(a-π/2)/sin(5π/2+a)*sin(a-2π)*cos(2π-a)
化简:cos(a-π/2)/sin(5π/2+a)*sin(a-2π)*cos(2π-a)

化简:cos(a-π/2)/sin(5π/2+a)*sin(a-2π)*cos(2π-a)
是cos(a-π/2)/(sin(5π/2+a)*sin(a-2π)*cos(2π-a))么?
cos(a-π/2)=-sin(a); sin(5π/2+a)=sin(π/2+a)=cos(a); sin(a-2π)=sin(a); cos(2π-a)=cos(a)
剩下的就好算了