原式是这样吧?sin(540-x)/tan(900-x) *1/(tan(450-x)tan(810-x) ) *cos(360-x)/sin(-x)sin(540-x)=sin(180-x)=sinxtan(900-x)=tan(-x)=-tanxtan(450-x)=tan(90-x)=cotxtan(810-x)=tan(90-x)=cotxcos(360-x)=cos(-x)=...