求证tan(x/2+45)+tan(x/2-45)=2tanx
求证tan(x/2+45)+tan(x/2-45)=2tanx
求证:tan(x/2+派/4)+tan(x/2-派/4)=2tanx
tan(x:2+45°)+tan(x:2-45°)=2tanx如何证明.
tanx+tan(π/2 -x)=?
tan(x/2)=2.求tanx
求证:(sin2x)(1+tanx*tan(x/2))/2cosx=tanx
求证:tan(x/2+π/4)+tan(x/2-π/4)=2tanx
证明tan(x/2+45°)+tan(x/2-45°)=2tanx,
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
设n>=2,当x不等于k派,求证:tanx*tan2x+tan2x*tan3x+.+tan(n-1)*tannx=tan