(1)求证:tan(x y)=2tanx;(2)若0
3sinX=sin(2X+Y) 求证:tan(X+Y)=2tanX
已知:3sinY=sin(2X+Y),求证tan(X+Y)=2tanX
已知5siny=sin(2x+y),求证:tan(x+y)=3/2tanx
求函数y=tan^2-tanx+1/tan^x+tanx+1的值域谢谢了,
求证:(sin2x)(1+tanx*tan(x/2))/2cosx=tanx
y=tan^2x+tanx+1的值域
若tanx=1/2,tan(x-y)==-2/5,则tan(2x-y)
求函数y=tan^2x-tanx+1/tan^2x+tanx+1的最大值与最小值
已知3sinb=sin[2a+b]求证sin2x/[2COSx]乘以[1+tanx-tan[x/2]]=tanx
求证:tan(x/2+派/4)+tan(x/2-派/4)=2tanx
求证tan(x/2+45)+tan(x/2-45)=2tanx
求证tanx+1/tan[(π/4)+X/2]=1/COSX