用cos x表示sin^4 x -sin^2 x +cos^2 x
用cos x表示sin^4 x -sin^2 x +cos^2 x
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x
cos 2x /sin^2 x*cos^2 x不定积分
2cos x (sin x -cos x)+1
(sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x?
化简 cos^2(x)*sin^2(x)-sin^2(x)
化简 cos^(2)(x)*sin^(2)(x)-sin^(2)(x)
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
∫sin(x) cos^2(x)dx
arctan(x) 化成用sin(x) cos(x)表示是多少?