证明:(tan^2)x-(sin^2)x=(tan^2)x(sin^2)x

证明:(tan^2)x-(sin^2)x=(tan^2)x(sin^2)x 证明tan^2x-sin^2x=tan^2 sin^2x 证明tan(x+y)+tan(x-y)=sin2x/cos^2x-sin^2y 证明tan^2x=2*tan^2y+1,求证sin^2y=2sin^2x-1 证明tan^θ-sin^2θ=tan^2θsin^2θ证明（1）tan^θ-sin^2θ=tan^2θsin^2θ（2）sin^4x+cos^4x=1-2sin^2cos^2x（31-tan^2x/1+tan^2x=cos^2x-sin^2x 证明1/sin^x+1/cos^2x-1/tanx^2x=2+tan^2 证明(1-2sin x cos x )/(cos^2x-sin^2x)=(1-tan x)/(1+tan x)谢谢谢谢 急 sin(2x) = (2*tan(x))/(1+tan(x)^2)有这个公式吗?求证明 证明(tan^2x-cot^2x)/(sin^2x+cos^2x)=sec^2x+csc^2x (1+tan(x))/sin(2x)不定积分 初三或者高中证明题,tan sin cos的东东证明,tan(X/2)=(1-cosX)/sinX 求证tan^x-sin^2x=tan^2x*sin^2x 证明tan^2x-sin^2x=tan^2x*sin^2x解sin^2x sin^2x--------- - -----------cos^2x 1等于sin^2x sin^2x--------- - -----------cos^2c cos^2x+sin^2x接下来还能做吗?这道题还有其他证法吗?怎么能等式两边同除呢？这是证明题，证 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 请问怎么证明sinX+sin(X+Y)+sin(X+2Y)/cosX+cos(X+Y)+cos(X+2Y)=tan(X+Y), 【高一数学】同角三角函数的证明题》》》证明：(tan^2)*(x)-(sin^2)*(x)=(tan^2)*x*(sin^2)*x证明上面式子,写出全过程,谢谢! 求证 (1/sin^2 x) + (1/cos^2 x) - （1/tan^2 x）= 2 + (tan^2 x)怎么证明啊……? 证明1/sin²x+1/cos²x-1/tan²x=2+tan²x限今天速度