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sin120度为什么等于sin60度

sin120=sin(180-60)=sin60

sin120°=sin(180°-120°)=sin60°=√3/2

sin120º =sin60º =(√3)/2

用公式sinx=sin(180-x)求 sin120=sin(180-60)=sin60 如果还不明白就画三角函数线,sinx=y/r,当角度为120度和60度时,对应的y相等,r为1,所以sin120=sin60

sin(x)=sin(180-x)

Cos60度=1/2 cos120=cos(180°-60°)=-cos60°=-1/2 sin120=sin(180°-60°)=sin60°=根号(1-1/4)=√3/2

sin30° = 2/1 sin45° = (√2)/2 sin60° = (√3)/2 sin120° = (√3)/2 cos30° = (√3)/2 cos45° = (√2)/2 cos60° = 2/1 cos120° = -2/1 tan30° = (√3)/3 tan45° = 1 tan60° = √3 tan120° = -(2-√3)/2

sin(120度)=sin(π-120)=sin60度=根号3/2 sin(135度)=sin(π-135)=sin45度=根号2/2 sin(150度)=sin(π-150)=sin30度=1/2

sin120度+sin60度≠sin180度 sin120度=√3/2 , sin60度=√3/2, sin180度=0

cos60° = sin120° 错。 cos60° = sin30° = sin150°

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