求证sin(x+3/1π)-根号3cos(3/2π-x)=2sin(x-3/1π)=0

求证sin(x+3/1π)-根号3cos(3/2π-x)=2sin(x-3/1π)=0 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 化简 1/2cos x-根号3/2sin x 根3sin x+cos x 根号3sin x+cos x要化简 化简 1/2cos x-根号3/2sin x 根号3 /2SIN X-1/2COS X 求证 cos（A）+ 根号3sin(A)=2sin(π/6+A) 求证:(根号3)*sinα+cosα=2sin(α+π/6) 求证(3-sin^4 x-cos^4 x)/2cos^2 x=1+tan^2 x+sin^2 x 求证：1-cos^4x-sin^4x/1-cos^6x-sin^6x=2/3 化简{sin(π+x)}/1+cos(3π-x)根号下(tanx-sinx)/(tanx+sinx) 三角等式求证：cos^6x+sin^6x=1-3sin^2x+3sin^4x (cos(x/2)/(根号1+sinx))+(sin(x/2)/根号(1-cosx)),x属于(3/2π,2π) 化简根号2sin(π/3-x)+根号6cos(π/3-x) 已知sin a+sin b=1/2,cos a+cos b=（根号3）/2,求证：sin(a+TT/3)=1/2 求证1、sin l-sin y=2cos（l+y)/2 sin（l-y）/22、cos l+cos y=2cos（l+y）/2 cos（l+y)/23、cos l-cos y=-2sin (l+y)/2 sin (l-y)/24、tanatan2a/(tan2a-tana)+根号3（sin²a-cos²a）=2sin(2a-π/3)对了,还有：是否存在锐角l,y, 方程x^2/(sin根号2-sin根号3)+y^2/(cos根号2-cos根号3)=1表示的曲线是 根号[1-2sin(3-π)cos(3-π)]化简