化简 (sin π/4 cos x)ˆ2-(cos π/4 sin x)ˆ2

化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x 化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 三角函数已知P(-4,3) 求(cos((π/2)+x)sin(-π-x))/(cos((11π/2)-x)sin((9 为什么sinˆ6 +cos ˆ6=sinˆ6(x+π/2)+cosˆ6(x+π/ 化简sin（2π+x）cos（π-x）sin（π-x）/cos（x-π）sin（-π-x）sin（π+x） Sqrt[2] * { Sin( x + π/4 ) * cos[ π/4 ] + Cos[ x + π/4] * si 证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4 用cos x表示sin^4 x -sin^2 x +cos^2 x 求证（cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2 化简f(x)=(1+√2*cos(2x-π/4))/sin(π/2-x) f(x)=2SIN^2(x+π\4)-cos(2x+π\6) 化简 谢