y=2sin(-2x+π/3) 和y=3cos(2/3x+π/4)单调区间

y=sin(x-π/6) 和 y=1/2sin(π/3-2x) 的单增区间, 判断单调性 y=sin(x-π/6) y=sin(-2x+π/3) y =(cos^2) x - sin (3^x),求y' 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(3x+2)求y' 3sin^2x+-2sin^2y=2sinx sin^2x+-sin^2y=? y=2sin(-2x+π/3) 和y=3cos(2/3x+π/4)单调区间 求y=sinxcos(2π/3-x)、y=sinx+sin(2π/3-x)的最大值和最小值 y=sin(π/4-2x)和y=cos(2x-π/3)求单调增区间. sinx=1/3,sin(x+y)=1,求sin（2y+x）=? 已知sinx=1/3,sin(x+y)=1,则sin（2y+x)= 如果 2sin(x-y)=sin(x+y),证明 tanx= 3 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=3sin(2x+π/4) x的最大值和最小值 Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) 当cos^2x-cos^2y=√3/2时,求sin(x+y）×sin(x-y) y=sin(π/3-π/2x)的周期