y=1/3sin(3x+π/7) ,x∈[0,+∞） 写出周期、频率、初相.说明函数的图象可由正弦曲线经过怎样变化得到

已知sinx=3/5,x∈(π/2,π),求【sin(x+y)+sin(x-y)】/【cos（x+y）+cos（x-y）】的值 y=sin(x+π/3)周期 求导：y=3^(sin*1/x) Y=SIN(3x-1) y=sin(1/3x+π/4),x∈R的周期. 判断单调性 y=sin(x-π/6) y=sin(-2x+π/3) y=|7sin(3x-5分之π)| sinx=1/3,sin(x+y)=1,求sin（2y+x）=? 已知sinx=1/3,sin(x+y)=1,则sin（2y+x)= 已知sin(x+y)=1/3,sin(x-y)=1/5,则tanx/tany siny=1/3,sin(x＋y)=1,求sin(2x＋y) (cosx)^2-(cosy)^2=1/3求sin(x+y)*sin(x-y). 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=sin(x-π/6) 和 y=1/2sin(π/3-2x) 的单增区间, Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2 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 sin^2x+cos^2y=1/2 求3sin^2x+sin^2y的最值