cos(540-α)sin(α-360)/sin(-α+180)cos(180+α)

cos(540-α)sin(α-360)/sin(-α+180)cos(180+α) .[1/cos(-α)+cos(180°+ α )]/[1/sin(540°-α)+sin(360°-α)]=tan^3α 化简cos(540°-α)sin(α-360°)/sin(-α+180°)cos(180°+α) 化简sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α) Cos(180°+α)*sin（α+360°)/sin(-α-180°)*cos(-180°-α) sinα-2cosα分之sinα+cosα sinαsinα+cosαcosα= sin αcosβ＋cos α sin β等于? 若sinα*cosα 若sinαcosα 若sinαcosα 已知sinαcosα 使sinα*cosα sinα+cosα 化简 sinα·cosα 已知sinα*cosα 已知sinα*cosα 已知sinα*cosα