sin^2x=4-2cos^2x请问下怎么算
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sin^2x=4-2cos^2x请问下怎么算
sin^3 x -cos^3 x sin^3 x -cos^3 x =(sin x -cos x )(sin^2 x +sin x*cos x +cos^2 x )问下这个是个公式还是什么?怎么样算出来的?
请问cos^2x/sin^4x的不定积分是多少
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
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
已知tanx=根号下2 求:1)(sin x+cos x)/(cos x -sin x)的值.2)2sin^2 x-sin x cos x+cos^2 x 的值
y=2cos x (sin x+cos x)
已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=?
化简sin^4x-sin^2x+cos^2x
化简:sin^4 x-sin^2 x+cos^2 x
sin(x/2)cos(x/2)=
化简sin^4x+cos^2x
y=(sin x + COS x)^2
化简(sin^2x-cos^4x+cos^2x-sin^4x)/(sin^2x-cos^6x+cos^2x-sin^6x)
cos 2x +根号下3乘sin 2x