一道三角函数证明题sin^4 X+cos^4 X=1-2sin^2 X cos^2 X
三角函数证明及化简题1.证明sin^6x+cos^6x=(sin^2x+cos^2x)(cos^4x-cos^2xsin
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
证明(1-2sin x cos x )/(cos^2x-sin^2x)=(1-tan x)/(1+tan x)
化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x
f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+/4π) 三角函数
一道高中三角函数数学题 已知函数f(x)=sin^4x+cos^2x+1/4sin2xcos2x(x∈R),则f(x)(
三角函数已知P(-4,3) 求(cos((π/2)+x)sin(-π-x))/(cos((11π/2)-x)sin((9
一道关于数学三角函数的题,哪位数学好的朋友帮哈忙,谢 证明sin(x+y)-sinx=2cos((2x+y)\2)sin
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
反三角函数证明如何证明sin^-1+cos^-1=派/2不好意思,是sin^-1(x)+cos^-1(x)=派/2就是a
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x