证明|x-y|≥|sinx-siny|

证明|x-y|≥|sinx-siny| |sinx-siny|≤|x-y|如何证明 证明不等式|sinx-siny|《 |x-y| 证明sin(x+y)sin(x-y)=sinx-siny 证明sinx+cos(x+y)siny/cosx-sin(x+y)siny=tan(x+y) 证明：对x≠y,恒有|sinx-siny| 证明.（sinx+siny)/cosx-cosy=ctg(y-x)/2 导数的应用证明不等式|(sinx-siny)/(x-y)-cosy| 证明 [sin(2x+y)/sinx]-2cos(x+y)=siny/sinx 证明cosx(cosx-cosy)+sinx(sinx-siny)=2sin(x-y)/2 证明sin(x+y)sin(x-y)=（sinx）^2-(siny）^2. 请问,如何证明sinx+siny=2*sin(x+y/2)*cos(x-y/2) 证明：对x不等于y,恒有｜sinx-siny｜< ｜x-y｜ 证明不等式|siny-sinx| Lim(Sinx-siny/x-y)极限 三角不等式证明证明sin(x+y)+sin(y+z)+sin(z+x)>sinx+siny+sinz+sin(x+y+z) 利用拉格朗日中值定理证明不等式|sinx-siny|≤|x-y| 利用拉格朗日中值定理证明,sinx-siny的绝对值小于等于x-y的绝对值.