17题

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17题17题17题sin(540-x)/tan(900-x)*1/tan(450-x)tan(810-x)*cos(360-x)/sin(-x)=sinx/(-tanx)*1/(cotx*cotx)*

17题
17题

17题
sin(540-x)/tan(900-x) * 1/tan(450-x)tan(810-x) * cos(360-x)/sin(-x)
= sinx/(-tanx) * 1/(cotx*cotx) * cosx/(-sinx)
= cosx * tanx * tanx / tanx
= sinx