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规定:sin(-x)=-sinx,cos(-x)=cosx,sin(x+y)=sinx•cosy+cosx•siny.据此判断下列等式成立的是___(写出所有正确的序号)①cos(-60°)=- 1 2 ;②sin75°=
【题目】如图,在平面直角坐标系中,已知矩形ABCD的三个顶点A(﹣3,4)、B(﹣3,0)、C(﹣1,0).以D为顶点的抛物线y=ax2+bx+c过点B.动点P从点D出发,沿DC边向点C运动,同时动点Q从点B出发,沿BA边向点A运动,点P、Q运动的速度均为每秒1个单位,运动的时间为t秒.过点P作PE⊥CD交BD于点E,过点E作EF⊥...
xecro TS22D-3POBR-3P12 VEM电机EB20RW80G4/77520.55KW230V0.55KW1420r/min4.15AIP55No:0826426009906H NORELEM配件33000-08 *KUBLER05.WKSW451-10m Vickers 870739 SEAL KIT FOR DGMX2-3-40 DGMR/ 1425510000 LMFS 5.00/22/90 3.5SN BK BX weidmuller 优势销售LECHLER德国*备件626.464.1F.37.00.0 ...
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