已知tanx=x,tany=y,且|x|≠|y|,则sin(x+y)/(x+y)-sin(x-y)/(x-y)=
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/16 11:27:27
已知tanx=x,tany=y,且|x|≠|y|,则sin(x+y)/(x+y)-sin(x-y)/(x-y)=已知tanx=x,tany=y,且|x|≠|y|,则sin(x+y)/(x+y)-sin
已知tanx=x,tany=y,且|x|≠|y|,则sin(x+y)/(x+y)-sin(x-y)/(x-y)=
已知tanx=x,tany=y,且|x|≠|y|,则sin(x+y)/(x+y)-sin(x-y)/(x-y)=
已知tanx=x,tany=y,且|x|≠|y|,则sin(x+y)/(x+y)-sin(x-y)/(x-y)=
由题知sinx/cosx=x siny/cosy=y 也即是sinx=xcosx与siny=xcosy
原式=(sinxcosy+cosxsiny)/(x+y)-(sinxcosy-cosxsiny)/(x-y)
=(xcosxcosy+ycosxcosy)/(x+y)-(xcosxcosy-ycosxcosy)/(x-y)
=(x+y)(cosxcosy)/(x+y)-(x-y)(cosxcosy)/(x-y)
=0
很高兴为您解答,【学习宝典】团队为您答题.
请点击下面的【选为满意回答】按钮,
tan(x+y)=tanx+tany吗
已知tanx=-3/4,且tan(x+y)=1,求tany的值
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))thanks
求证tanx+tany/tanx-tany=sin(x+y）/sin(x-y)
已知tanx=1/2,tany=1/3,且x,y都是锐角,求证x+y=45°
已知tanx=1/2,tany=1/3,且x,y都是锐角,求证x+y=1
已知tanx=1/7,tany=1/3,且x,y为锐角,求x+2Y的值
已知tanx=1/7,tany=1/3,且x,y为锐角,求x+2Y的值
已知tanx=x,tany=y,且|x|≠|y|,则sin(x+y)/(x+y)-sin(x-y)/(x-y)=
已知sin(x+y)=1/3,sin(x-y)=1/5,则tanx/tany
已知sin(x+y)/cos(x-y)=m/n,则tanx/tany=?
已知tanx=2,tany=3,x,y∈(0,π/2),求x+y.
已知0小于X,y小于90度,tanx=3tany,求证x-y
如果实数x,y满足|tanx|+|tany|>|tanx+tany|,且y∈（π,3π/2),则|tanx-tany|等于
若0≤x-y＜π/2,且tanx=3tany,则x-y的最大值为?tan(x-y)=(tanx-tany)/(1+tanxtany)=2tany/(1+3tan^2y)=2/(1/tany+3tany)为什么是小于等于这个呢?不懂 ≤2/2√(1/tany*3tany)
x +y=90°,tanx*tany=?
求证tanx+tany/tanx-tany=sin（x+y）/sin（x-y）（详细步骤）
已知tanx=2,tany=1/3,则tan2(x+y)=