化简:tan(x-60°)tanx+tanxtan(x+60°)+tan(x+60°)tan(x-60°),
化简:tan(x-60°)tanx+tanxtan(x+60°)+tan(x+60°)tan(x-60°),
证明tanx+tanβ=tan(x+β)-tanxtanβtan(x+β)
证明tan(x/2+45°)+tan(x/2-45°)=2tanx,
tan(x:2+45°)+tan(x:2-45°)=2tanx如何证明.
化简 (sin(540°-x))/(tan(900°-x))*(1/(tan(450°-x)tan(810°-x))*(
化简 tan(18°-x)tan(12°+x)+根号3乘[tan(18°-x)+tan(12°+x)]=
求函数y=tan^2(x)-2tan(x),X属于(-60,60)的值域
化简tan(18-x)tan(12+x)+根号3[tan(18-x)+tan(12+x)]
tanx+tan(π/2 -x)=?
tan(x/2)=2.求tanx
化简cos²(-X)-【tan(360°+X)】/【sin(-X)】
tan( x/2+π/4)+tan(x/2-π/4 )=2tanx