sin｛π－α｝cos｛2π－α｝tan｛－α＋π｝/sin｛π＋α)
=sin｛α｝cos｛α｝tan｛－α｝/sin｛-α｝
=sin｛α｝cos｛α｝-tan｛α｝/-sin｛α｝
=cos｛α｝tan｛α｝
=sinα
sin｛π－α｝cos｛2π－α｝tan｛－α＋π｝/sin｛π＋α｝化简
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