求sin﹙-1200°﹚·cos1290+cos﹙-1020°﹚·sin﹙-1050°﹚+tan945°的值

求sin﹙-1200°﹚·cos1290+cos﹙-1020°﹚·sin﹙-1050°﹚+tan945°的值 求sin(-1200°）×cos1290°+cos9-1020°)×sin（-1500°）+tan945° 求sin(-1200°）×cos1290°+cos9-1020°)×sin（-1500°）+tan95° 求sin(―1200°)·cos1290°+cos(―1020°)·sin(―1050°)+tan945°的值． 求sin(-1200°)×cos1290°+cos(-1020°)×sin(-1050°)的值求解求解吖~~~~ sin(-1200°)-cos1290°+cos(-120)°+cos(-1020)°-sin(-1050°)+tan855° sin(-1200°)cos1290°+cos(-1020°）sin（-1050°)+tan855求值.. 求音乐：sin( 1200度)cos1290度 cos( 1020度)in( 1050度)+tan495度 sin(-330°)怎么求? ﹙4cosα－3sinα﹚×﹙2cosα－3sinα﹚＝0求tan﹙α﹢45°﹚ 求函数y=﹙sin²α－5sinα+7﹚／﹙3－sinα﹚的值域 求sin²10°+sin²20°+sin²40°+sin²50°+sin²70°+sin²80° 在ΔABC中sin²B－sin²A－sin²C＝﹙根号3﹚×sinA×sinC 求B度数 求sin平方10°+sin平方20°+.+sin平方80°的值 sin(π-α)=-2sin(π/2+α),求sinα·cosα 求sin²1°+sin²2°+sin²3°……sin²89°=? 求﹙sinπ/7﹚·﹙sin2π/7﹚·﹙sin3π/7﹚的值 求sin（-1050°）三角函数值