y=sin(2x+π/4)x∈[-π/4,3π/4]的减区间是?

y=sin(2x+π/6),x∈[π/4,3π/4]求值域 y=|sin(2x+π/4)|+2的周期 y=4sin^2πx的周期是多少 求函数y=3sin(2x+π/4),x∈R的周期 y=3sin(2x+π/4),x∈R的单调区间 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, y=x^3sin^2x是奇函数还是偶函数还有y=x^cosx、y=5sin（3x-π/4） 2sin(x+π/4)sin(x-π/4)=? 求下列函数周期 y=3sin(x/4) x属于Ry=2sin(2x-π/6) 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! 已知sinx=3/5,x∈(π/2,π),求【sin(x+y)+sin(x-y)】/【cos（x+y）+cos（x-y）】的值 5cos（2x-y）+7cosy=0 ,tan（x-y）tanx=?y=sin²（x+π/4)-sin²（x-π/4),x∈（π/6,π/3）值域 y=2cos(x/4+ π/3)-3sin(x- π/4)y=sin(4x- π/3)-cos(3x+π/2) 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 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