y=sin(π/4+x/2)sin(π/4-x/2) =sin(π/4+x/2)sin[π/2-(π/4+x/2)]如何变的?说明公式

2sin(x+π/4)sin(x-π/4)=? 判断单调性 y=sin(x-π/6) y=sin(-2x+π/3) y=|sin(2x+π/4)|+2的周期 y=4sin^2πx的周期是多少 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, 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! 求下列函数周期 y=3sin(x/4) x属于Ry=2sin(2x-π/6) 求函数y=sin^2(x+π/4)+sin(x+π/4)sin(x-π/4)的周期,单调减区间,值域 y=sin(π/2+πx)sinπx的最小正周期为 y=sin(π/2+πx)sinπx最小正周期 函数y=sin(x+π/4)sin(x-π/4)的周期为 关于函数y=sin(x+π/4)+sin(π/4-x),是奇函数还是偶函数 函数y=sin(x+π/4)+sin(x-π/4)的最大值 函数y=4sin(x+π/6)+3sin(π/3-x)的最大值是多少 y=12sin(2x+π/6)+5sin(π/3-2x)最大值 y=12sin(2x+π/6)+5sin(π/3-2x)的最大值 y=sin(x+π/3)sin(x+π/2)化简