怎样算Sin2X-2Sin^2X =Sin2X+COS2X-1

怎样算Sin2X-2Sin^2X =Sin2X+COS2X-1 Sin2x=sin^2x 化简f(x)=sin2x-2sin^2x*sin2x sin2x=sin(x/2) 0 g(x)=2sin2x-2sin(2x+π/3)怎样变成g（x）=2sin2x-2[(sin2x)*(1/2)+(cos2x)(√3/2)] sin2x-x 是(sin2x)-x还是sin(2x-x)? 证明 2sin(π+x)cos(π-x)=sin2x f(x)=sin2x+2sin(x+45°)最大值 sin2x-2sin平方x*sin2x的奇偶性和周期? y=根号2sin2x变换到sin^2x+sin2x+2cos^2x f(x)=sin2x-2sin^2x*sin2x最小正周期等于多少? sin^2x=2sinxcosx=sin2x吗? 为什么sin2x+cos2x=2sin(2x+π/4) sin2x + 2sin^2x=sinx + cosx 三角方程求解 已知函数fx=2sin^2x+sin2x. y=sin2x+2sin^2 x-1 求化简 tanx=1/2,sin2x+sin^2x 函数y=sin方2x+sin2x的值域