sin-120度怎么算

弓姚巧795sin负1200度是多少 -
巫方博19885028039 ______[答案] sin-1200°=sin-120°=-sin120°=-√3/2

弓姚巧795sin负1200度是多少 -
巫方博19885028039 ______ sin-1200°=sin-120°=-sin120°=-√3/2

弓姚巧795Sin1320°的值 -
巫方博19885028039 ______ Sin1320°=sin(3*360°+240°)=sin240°=sin(180°+60°)=-sin60°=-√3/2

弓姚巧795sin - 1560°等于多少
巫方博19885028039 ______ sin -1560°=sin(-1560+360*4)=sin-120=-2分之根号3

弓姚巧795sin( - 120°)cos1290°+cos( - 1020°)sin( - 1050°)=______. -
巫方博19885028039 ______[答案] 原式=-sin120°cos(4*360°-150°)-cos(-3*360°+60°)sin(-3*360°+30°) =sin120°cos30°-cos60°sin30°= 3 2* 3 2- 1 2* 1 2= 3 4- 1 4= 1 2. 故答案为: 1 2

弓姚巧795sin( - 1200度)的具体计算过程? -
巫方博19885028039 ______ sin(-1200°)=-sin(1200°) =-sin(3*360°+120°) =-sin(120°) =-sin(180°-60°) =-sin(60°) =-√3/2

弓姚巧795sin120°与sin - 120°有区别吗 -
巫方博19885028039 ______[答案] 从坐标轴上看sin-120°=sin240°与sin120°就不一样了

弓姚巧795sina120度等于几? -
巫方博19885028039 ______ sin120度=√3/2

弓姚巧795求Sin120度的三角函数值刚学三角函数. -
巫方博19885028039 ______[答案] sin120=sin(180-120)=sin60=(√3)/2

弓姚巧795sin( - 1200度)等于多少?
巫方博19885028039 ______ sin(-1200)=sin(-120)=负2分之根号3