化简cos(x-兀)/sin(兀-x) xsin(x-2兀)Xcos(2兀-x)求过程!
求证 cos*xcos*y + sin*xsin*y + sin*xcos*y + xin*ycos*x = 1
化简cos^4x+sin^2xcos^2x+sin^2x
sin^2x+cos^2x)(sin^4x-sin^2xcos^2x+cos^4x) =sin^4x-sin^2xcos
求函数f(x)=(sin^4x+cos^4x+sin^2xcos^2x)/2
求函数f(x)=(sin⁴x+cos⁴x+sin²xcos²x)/(2-si
(1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x
求函数y=2sin xcos x+2sin x+2cos x+4的值域
求sin^4x+cos^4x+4sin^2xcos^2x-1的最小正周期及值域.
(2xsin(y/x)-ycos(y/x))dx+(xcos(y/x)+1)dy=0 求y
证明sin4次方x+cos四次方x=1-2sin²xcos²x
已知函数f(x)=a(cos^2 x+sin xcos x)+b.
三角函数证明及化简题1.证明sin^6x+cos^6x=(sin^2x+cos^2x)(cos^4x-cos^2xsin