tan^2(x)等於sin^2(x)/cos^2(x)吗?

tan^2(x)等於sin^2(x)/cos^2(x)吗? (1+tan(x))/sin(2x)不定积分 证明:(tan^2)x-(sin^2)x=(tan^2)x(sin^2)x 求证tan^x-sin^2x=tan^2x*sin^2x 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 证明tan^2x-sin^2x=tan^2 sin^2x 化简(sin^2 x/sin x-cosx)-(sin x+cosx/tan^2 x-1) tan(x)=2求sin(x)cos(x)=? 求证：tan x/2=sin x/(1+cos x) 求证：1-sin(x)=cos(x)*tan(x/2) 求极限：sin x^tan x(x→π/2) tan x=2,求 sin x * cos x=? lim[(sin x)^tan x],x趋向于Pai/2 已知:tan x=2 求:sin x+cos x/sin x-cos x=? tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 顺便问一下. tan,sin,cos是什么意思? 化简:cos(x-派)tan(x-2派)tan(2派-x)/sin(派+X) 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 求∫1／tan^2x+sin^2x dx