cos(X-Y)=0.5 sin2X+sin2Y=2/3 则sin(X+Y)=__________
若cosxcosy+sinxsiny=12,sin2x+sin2y=23,则sin(x+y)= ___ .
sin(y+x)+根号3cos(x-y)为偶函数,tan(y)=__________
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x
求函数 y=sin3x*sin^3x+cos3xcos^x/cos^22x +sin2x
Y=sin^2x+sin2x+2cos^2x化简
y=sin^2X+sin2X+3怎么求最值?
y =(cos^2) x - sin (3^x),求y'
求函数y=[sin2x+sin(2x+π/3)]/[cos2x +cos(2x+π/3)]的最小正周期
已知 兀/2 < Y < X< 3兀/4,cos(X+Y)=12/13,sin(X+Y)=-3/5,求sin2X.
已知 兀/2 < Y < X< 3兀/4,cos(X-Y)=12/13,sin(X+Y)=-3/5,求sin2X.
1.f(x)=根号下1-x y属于(4分之3π,π),则f(sin2y)+f(-sin2y)=
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)