化简:(1/tan(a/2)-tana/2)(1+tanatana/2)

化简:tana+tan(派/2+a)+4tana/1-tanatana 化简tana+(1+tana)tan(π/4-a) 求证tan(A/2)-{1/(tanA/2)}=-2/tanA 求证tan(a/2)-1/(tana/2)=-2/tana tan(a+b)-1/tana=2*tana 请化简! 化简:(1/tan(a/2)-tana/2)(1+tanatana/2) 化简{(tan^2a/3)/(tana/3) 证明2tana/1-tan^2a证明2tana/1-tan^2a=tan2a tana+1/tana=3,求sina*cosa tan^2 a+1/tan^2 a tana+1/tana=9/4,则tan^2+1/sinacosa+1/tan^2a=? tana+1/tana=9/4,则tan^2+1/sinacosa+1/tan^2a=? 已知tanA-(1/tanA)=2,其中A为锐角,求tan^2+(1/tan^2) tan²a-2tana-3=0.tana=3或tana=-1 已知tan(A-B)/tanA+sin^2C/sin^2A=1,求证：tanA×tanB＝tan^C求证tanA×tanB＝tan^2C tan(a/2)-1/tan(a/2)=-2/tana 化简改为求证tan(a/2)-1/tan(a/2)=-2/tana 若锐角A满足tanA+1/(tanA)=3,则tan^2A+1/(tan^2A)=? tan2a 为什么等于//2tana / 1-tan^2 a呢 tan(x/4+a)=1/2 tana等于多少?