函数y=(cos^2x-sin^2x)tan2x的最小正周期为____________

函数y=cos^2X-sin^2x最小值 y=1-sin(2x)/sin(x)-cos(x)求T.最值 已知函数y=(sin x+ cos x)(sin x+cos x)+2cos x*cos x ,求它的递减区间语气亲和、态度友好 求函数y =cos 2x +sin 2x /cos 2x -sin 2x 的最小正周期 y=(sin x + COS x)^2 函数y=cos^2(x/4)-sin^2(x/4)的最小正周期T= ? y=2cos x (sin x+cos x) 求函数y=7-4sin(x)cos(x)+4cos^2(x)-4cos^4(x)值 函数y=cos^4x-sin^4x的最小正周期y=(cos^2x+sin^2x)(cos^2x-sin^2x)为什么等于cos^2x-sin^2x=cos2x谢谢 函数y=x-sin x/2*cos x/2的导函数是什么 已知函数f(x) =√3cos(2x-y)-sin(2x-y) (0 求函数y=sin^4 x-cos^4x 最小正周期?化简：sin^2x-cos^2x=1-2cos^2x=- cos2x .T=2π//2=π matlab微分方程画图问题已知：x'[t] = 2 (Sin[t] - x[t]) /Sqrt[(Sin[t] - x[t])^2 + (Cos[t] - y[t])^2]y'[t] = 2 (Cos[t] - y[t]) /Sqrt[(Sin[t] - x[t])^2 + (Cos[t] - y[t])^2]初始x[0]=0y[0]=0画出（x,y）的轨迹 求解matlab绘制参数函数y=50*cos(t)-40*cos(t+7.5*((1-cos(3.1415926*t/55))-0.25*(1-cos(2*3.1415926*t/55))+36.86);x=50*sin(t)-40*sin(t+7.5*((1-cos(3.1415926*t/55))-0.25*(1-cos(2*3.1415926*t/55))+36.86);就是绘制这个方程的函数图象,t是 sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 函数y=(sin x+cos x)²+2cos² x怎么花成同名函数. 已知函数Y=2sin^X+2sinXcosX-5cos^X 已知函数Y=2sin^X+2sinXcosX-5cos^X,帮我化简 函数y=cos^2x+3sin^2x是最小正周期为?函数,