如何将y=(sin^2(x/4)+cos^2(x/4))^2-2sin^2(x/4)cos^2(x/4)变形到(3/4)+(1/4)cosx?

如何将y=4sin(2x+pai/3)变化成y=4cos(2x-pai/6),指图像变化,如何描述,速求!多谢! 如何将y=(sin^2(x/4)+cos^2(x/4))^2-2sin^2(x/4)cos^2(x/4)变形到(3/4)+(1/4)cosx? cosh (x + y)已知cos (x + y) = cos x cos y − sin x sin y求：cosh (x + y)再补充：求的是如何将cosh (x + y) 变成coshx cos hy - sin hx sin hy而不是证明cos h(x + y) = coshx cos hy - sin hx sin hy y=(sin x + COS x)^2 怎样将cos转换为sin?y=100cos(2π/364)+1140,如何将COS的式子转为SIN?急. y=2cos x (sin x+cos x) 如何将y=cos(2x+π/3)的图象变化得y=sin(2x-π/6)的图象? 请问,如何证明sinx+siny=2*sin(x+y/2)*cos(x-y/2) sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 将f(x)=2sin^4 x+2cos^4 x+cos^2 x-3化简化成y=Asin(wx+b)+c形式 cos(x+y)-cosx如何等于-2sin[(2x+y)/2]sin(y/2), 已知函数f(x)=根号3sin2x+2sin(派/4+x)cos(派/4+x)将f(x)化为y=sin 已知sinθ+cosθ=2sinx,sinθcosθ=sin²y,求证：4cos²2x=cos²2y 证明COS（X+Y）COS（X-Y）=COS^2X-SIN^2Y 证明cos(x+y)cos(x-y)= cos^2(x)-sin^2(y) 如何将sin(2x)*cos(x)+sin^2(x) 展开为sin(x)的表达式?或者如何化简? 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 y=4√2sin x cos x+cos 2x 的值域是