已知(tana)^2=2(tanβ)^2+1 求证(sinβ)^2=2(sina)^2-1

已知(tana)^2=2(tanβ)^2+1 求证(sinβ)^2=2(sina)^2-1 已知tan(A-B)/tanA+sin^2C/sin^2A=1,求证：tanA*tanB=tan^2C 已知tan(a-r)/tana+sin^2b/sin^2a=1 ,求证tan^2b=tana*tanr.. 求证sin^2a*tana+cos^2a*1/tana+2sina*cosa=tana+1/tana 已知(1+tana)/(1—tana)=3+2根号2,求证：（sina+cosa)²-cosa的三次方/sin 求证tana/2=sina/1+cosa 已知3sinβ=sin(2a+β）,求证：tan(a+β）=2tana 求证sin与tan 已知3sinB=sin(2A+B),求证tan(A+B)=2tanA 求证tan(A/2)-{1/(tanA/2)}=-2/tanA 求证tan(a/2)-1/(tana/2)=-2/tana 求证1+sina-cosa/1+sina+cosa=tana/2 已知(sina)^2÷(cosβ)^2+(cosa)^2(cosγ)^2=1,求证（tana)^2÷（tan)^2=（s