sin(540-x)cos(360-x) / tan(900-x)tan(450-x)tan(810-x)sin(-x)
= sin(180-x)cos(-x) / tan(180-x)tan(90-x)tan(90-x)sin(-x)
= - sin(x)cos(x)tan(x)tan(x)cos(180-x) / sin(180-x)sin(x)
= cos^2(x)tan^2(x) / sin(x)
= sinx