解方程：(1)sin2x=cos3x (2)sin(2x+π/3)+sin(x-π/6)=0 (3)sin(x+π/6)

已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x) 化简：2cos2x+2sin^2 x+cos(-x)分之sin2x+sin(π-x)=___________ y=sin2x y=sin(x+π/3) y=3sin(2x+π/3) 已知sinα是方程5x²-7x-6=0的根,求[sin(-α+3π/2)sin(π-α)tan²(2 已知函数f(x)=(1+1/tanx)sin2x-2sin(x+π/4)sin(x-π/4) 解方程 sin 2x + sin x = 0 函数f(x)=-√2(sin2x+π/4)+6 sin x cos x-2cos²x+1 解方程sinx*cosx=1/4 2sin²x=1 3sin²x-sin2x-cos²x= 已知cos（x+π/4）=3/5求sin2x-2sin^2x 函数f（x）=sin(-2x+π/3）+sin2x的最大值是 tan(π/4-x)=-1/3,sin^2 (x+π/4) /(2cos^2 x+sin2x)=? 1.y=cos^4x+sin^4x 求周期 2.y=（sin2x+sin（2x+π/3)）/（ cos2x+cos（2x