化简sin^4X-cos^4X
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
化简cos^4x+sin^2xcos^2x+sin^2x
根号下(sin""x+4cos"x)-根号下(cos""x+4sin"x)=?
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
d/dx sin^8(cos(4x))
sin^2x+cos^2x)(sin^4x-sin^2xcos^2x+cos^4x) =sin^4x-sin^2xcos
(1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x
化简:1,sin(pai/4-x)sin(pai/4+x) 2,cosA+cos(120度-A)+cos(120度+A)