化简cos(90°-α)/sin(270°-α)*sin(360°-α)*sin(180°-α)
问题描述:
化简cos(90°-α)/sin(270°-α)*sin(360°-α)*sin(180°-α)
答
cos(90°-α)/sin(270°-α)*sin(360°-α)*sin(180°-α)
=sinα/(-cosα)*(-sinα)*sinα=1/sinacosa