(1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x
(1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x
sin^2x+cos^2x)(sin^4x-sin^2xcos^2x+cos^4x) =sin^4x-sin^2xcos
化简cos^4x+sin^2xcos^2x+sin^2x
化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x
求sin^4x+cos^4x+4sin^2xcos^2x-1的最小正周期及值域.
求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/2
求函数y=2sin xcos x+2sin x+2cos x+4的值域
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
三角等式求证:cos^6x+sin^6x=1-3sin^2x+3sin^4x
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
x趋于0时,lim(x^2-sin^2 xcos^2 x)/(x^2sin^2 x)怎么转换成(x^2-(1/4)sin
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1