x+y=四分之三π (1-tanx)乘以(1-tany)等于多少?
tanX=2分之1,tan(x+y)=5分之2,那么tanY=?
若sin(x+y)=1/2,sin(x-y)=1/3,则tanx/tany等于?
sin(x+y)=1\2,sin(x—y)=1\3,求[tan(x+y)-tanx-tany]\[tany的平方tan(
己知tanx,tany,是方程7㎡-8m+1=0的两根,则tan[(x+y)÷2]等于多少.求详解.
cos(x+y)=1/5,cos(x-y)=3/5则tanx.tany=?
求证tanx+tany/tanx-tany=sin(x+y)/sin(x-y)(详细步骤)
已知tanx+tany=5m,tan(x+y)=6m(m≠0),tan(x-y)=1/7,求m的值及tanx,tany的
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
已知tanx=2,tany=1/3,则tan2(x+y)=
已知tanx=1/4,tany=-3,求tan(x+y)的值
已知tanx=-3/4,且tan(x+y)=1,求tany的值