化简sin(x+y)cos(x-y)+cos(x+y)sin(x-y)

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/29 08:56:25

sin(x+y)cos(x-y)+cos(x+y)sin(x-y)
=sin(x+y+x-y)
=sin2x
再问： sin(x+y)cos(x-y)+cos(x+y)sin(x-y) 为什么=sin(x+y+x-y) 公式是吗
再答：是 sin(a+b)=sinacosb+cosasinb
再问： tanA=tan[(A-B)+B]=[tan(a-B)+tanB]/[1-tan(A-B)*tanB]也是公式吗
再答：嗯 tan(a+b)=(tana+tanb)/(1-tanatanb)

化简sin(x+y)cos(x-y)+cos(x+y)sin(x-y) 化简sin(2x-y)*sin y+cos(2x-y)*sin y 化简sin(x+y)sinx+cos(x+y)cosx等于? 化简sin(x+y)sinx+cos(x+y)cosx 化简cos(x+y)sinx-sin(x+y)cosx sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) 证明COS（X+Y）COS（X-Y）=COS^2X-SIN^2Y Matlab编程问题 cos(x*y)*cos(x*(1-y))-0.5x*sin(x*y)*sin(x*(1-y))= y＝(sin x)＋cos sinx*sin(x+y)+cosx*cos(x+y)等于? y =(cos^2) x - sin (3^x),求y'