已知sin(x-y)cosx-cos(x-y)sinx=五分之三求tan2y的值
已知sin(x-y)cosx-cos(x-y)sinx=五分之三求tan2y的值
已知函数y=sin平方x+2sinx·cosx+3cos平方 求y的取值范围
已知cos(x-y)cosx+sin(x-y)sinx=3/5,则cosy的值为
已知sinx+siny=1/3,cosx-cosy=1/5,求cos(x+y),sin(x-y).
已知函数y=sin²x+sinx+cosx+2,求函数y的值域
sinx*sin(x+y)+cosx*cos(x+y)等于?
化简sin(x+y)sinx+cos(x+y)cosx等于?
化简sin(x+y)sinx+cos(x+y)cosx
cos(x+y)sinx-sin(x+y)cosx
化简cos(x+y)sinx-sin(x+y)cosx
已知sin^4x+cos^4x=1,求sinx+cosx的值
已知sin^4x+cos^x=1,求sinx+cosx的值