题目内容：

化简 （sin(540°-x))/(tan(900°-x))*(1/(tan(450°-x)tan(810°-x))*((cos(360°-x))/(sin(-x))

优质解答

sin(540-x)=sin(360+180-x)=sin(180-x)=sinxtan(900-x)=tan(-x)=-tanxtan(450-x)=tan(360+90-x)=tan(90-x)=cotxtan(810-x)=tan(720+90-x)=tan(90-x)=cotxcos(360-x)=cos(-x)=cosasin(-x)=-sinx所以原式=(-sinx/tanx)...