x^2/(sin根2+sin根3)+y^2/(cos根2+cos根3)=1

x^2/(sin根2+sin根3)+y^2/(cos根2+cos根3)=1 化简 1/2cos x-根号3/2sin x 根3sin x+cos x Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) y =(cos^2) x - sin (3^x),求y' sin^2x+cos^2y=1/2 求3sin^2x+sin^2y的最值 参数方程化为普通方程 x=(sinθ+cosθ)/(2sinθ+3cosθ) y=sinθ/(2sinθ+3cosθ） (1/2)已知sin2a=3/5;求cos a的值 求满足sin(a-x)-sin(a+x)+2cos a= 负十分之根 化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x sin(x+y)sin(x-y)=k,求cos^2x-cos^2y y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解 求导f(x) = cos(3x) * cos(2x) + sin(3x) * sin(2x).