y=-2sin(x+π/4)-1和y=sin²x-sinx+1当x∈R或x∈[π/2,π]时的最值分别是

已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2 求函数y=2sin(π/4-x)和y=2sin(x-π/4)的单调区间 y=-2Sin(x+π/4)的图像和y=2Sin(x+π/4)的关系,急! y=sin(x-π/6) 和 y=1/2sin(π/3-2x) 的单增区间, y=2sin三分之一x y=4sin(x-π/3) y=sin(2x+π/6) y=3sin(1/2x-π/4) 的周期各是多少, 解微分方程：x(y´+1)+sin(x+y)=0, y(π/2)=0 y=3sin(1/2x-π/4)+1的最值和单调区间 求y=2sin（2x+π/4）-1的对称轴和对称中心 已知x+y=根号2sin(a+π/4),x-y=根号2sin(a-π/4),求证x^2+y^2=1 已知x+y=根号2sin(a+π/4),x-y=根号2sin(a-π/4),求证x^2+y^2=1 已知x+y=根号2sin(α+π/4),x-y=根号2sin(α-π/4),求证x²+y²=1 y =sin(2x-1)求导! 证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+y)/2) y=sin^2(x+π/2）-sin^2(x-π/4)的最小正周期和值域 y=sin｛2（x+4/π）｝+1怎么化简成y=2cos2x y=2sin(-2x+π/3) 和y=3cos(2/3x+π/4)单调区间 y=sin(π/4-2x)和y=cos(2x-π/3)求单调增区间. y=sin^2*1/x求y