求满足方程(tanx)^4+(tany)^4+2(cotx)^2(coty)^2=3+sin^2 (x+y)的所有实数对
sin(x+y)=1\2,sin(x—y)=1\3,求[tan(x+y)-tanx-tany]\[tany的平方tan(
tanx+tany=25 cotx+coty=30,那么tan(x+y)=?
tanx+tany=25,cotx+coty=30.tan(x+y)=?
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
tanX,tanY是方程X²+(4M+1)X+2M=0的俩根,且M≠-1/2求sin(X+Y)/cos(X-Y
已知sin(x+2y)=3sinx,求tan(x+y)*coty
已知x,y,z都是锐角,sin^2x+sin^2y+sin^2z=1,求tanx*tany*tanz的最值
求Y=TANX+COTX,Y=SINX的绝对值+COSX的绝对值,Y=[SIN(2X+PAI/4+COS(2X+PAI/
若sin(x+y)=1/2,sin(x-y)=1/3,则tanx/tany等于?
已知tanx,tany是方程x^2+6x+7=0的两个根,求证sin(x+y)=cos(x+y).
设m为实数,tanx和tany是方程mx^2+(2m-3)x+(m-2)=0的两个实数根,求tan(x+y)的最小值
已知tanx=2,tany=3,x,y∈(0,π/2),求x+y.