若x=兀/12 sin^4-cos^4=
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若x=兀/12 sin^4-cos^4=
证明sin^4x-cos^4x=sin^2x-cos^2x
求证sin^4x-cos^4x=sin^2x-cos^2x
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 2x
若sinx+sin^2x=1,则cos^2x+cos^4x=?
若x=π/12,则sin^4x-cos^4x=?
若x=π/12,则cos^4x-sin^4x=
证明一个sin&cos的等式证明 1+sin^2(x)+sin^4(x)+sin^6(x)=[1-sin^8(x)]/[cos^2(x)]
sin(sin(sin(sin(x)=cos(cos(cos(cos(x),X等于多少?
若sin(兀/3-x)=1/4,则cos(兀/3+2x)等于多少
关于sin^2x+cos^2x 的应用式子:cos^6x+sin^6x=(cos^2x+sin^2x)(cos^4x-cos^2xsin^x+sin^4x)=(cos^2x+sin^2x)^2-3sin^2xcos^2x 求这两步算法中的具体思路 ps:cos^2x=cosx的二次方
关于三角函数的一道题(高中)cos(10)*cos(20)*cos(40)=?类似cos(X)*cos(2x)*cos(4x)=?sin(x)*sin(2x)*sin(4x)=?的题目有没有什么规律
求证(3-sin^4 x-cos^4 x)/2cos^2 x=1+tan^2 x+sin^2 x
化简y=sin^4x-cos^4x,
cos^4x-sin^4x=cos2x 为什么
y=sin^4x+cos^4x的值域
∫cos^4x/sin^3x dx=?