cos120度等于sin多少度

能物美2500120度的余弦值是多少 -
滑郎鸣13631078772 ______[答案] cos120° =cos(30+90) =-sin30 =-1/2

能物美2500cos120° =cos(180 - 60) -
滑郎鸣13631078772 ______ 可以的,但是不太好 cos120° =cos(180-60) cos120° =cos(90+30) =-sin(30) (不懂问我

能物美2500Sin150度,=什么,Cos120度,=什么,tan135度,= -
滑郎鸣13631078772 ______ sin150°=sin(180°-30°)=sin30°=1/2 ;cos120°=cos(180°-60°)=-cos60°=-1/2 ;tan135°=tan(180°-45)=-tan45° ;又∵tan45°=1,∴tan135°=-1 .

能物美2500cos120和sin120各是多少 -
滑郎鸣13631078772 ______ SIN120=COS90+30=-COS30=-3分之根号3...同理COS120=SIN90+30=SIN30=2/1

能物美2500sin cot tan cos120度是多少``怎么算啊` -
滑郎鸣13631078772 ______ sin120度=(根号3)/2 cot120度=cos120/sin120=-(根号3)/3 cos120度=-1/2

能物美2500请问sin120度等不等于sin60度还是 - sin60度?为什么,cos120度呢?,tan120度呢? -
滑郎鸣13631078772 ______[答案] 根据公式 sin(180'-a)=sina,所以sin60'=sin120' cos120=-cos(180-120)=-cos60 tan120=-tan(180-120)=-tan60

能物美2500Sin150度,=什么,Cos120度,=什么,tan135度,= -
滑郎鸣13631078772 ______[答案] sin150°=sin(180°-30°)=sin30°=1/2 ; cos120°=cos(180°-60°)=-cos60°=-1/2 ; tan135°=tan(180°-45)=-tan45° ; 又∵tan45°=1,∴tan135°=-1 .

能物美2500谁能给我算一下cos120等于 - 0.5 -
滑郎鸣13631078772 ______[答案] cos120=cos(90+30)=cos90cos30-sin90sin30=0-1X0.5=-0.5 或者:COS120=Sin(90-120)=sin(-30)=-sin30=0.5

能物美2500sin120°=?cos120°=?tan120°=? -
滑郎鸣13631078772 ______[答案] sin120°=sin(180°-60°)= sin60° = 根号3/2 cos120°=cos(180°-60°)= -cos60° = -1/2 tan120°=tan(180°-60°)= -tan60° = -根号3

能物美2500cos120º20′和sin120º20′分别等于多少啊? -
滑郎鸣13631078772 ______[答案] -0.505029841 0.863101882