已知sinθ=(a-1)sinψ,tanθ=(a+1)tanψ,|a|≥6求角θ的取值范围

已知sinθ=(a-1)sinψ,tanθ=(a+1)tanψ,|a|≥6求角θ的取值范围 证明恒等式tan a*sin a/tan a-sin a=1+cos a/sin a 已知tan a=2 求 sin平方a－3sin a×cos a+1 已知tanθ=a(a>1),求sin(π/4+θ)/sin(π/2-θ)×tan2θ的值 已知sinα=a*sin(α+β) (a>1),求证:tan(α+β)=sinβ/(cosβ-a) 已知 tan a =1 3sin(a+b)=sin(2a+b) ,求 tan(a+b) 的 值. 求证 tanθ(1+sinθ )+sinθ /tanθ (1+sinθ )-sinθ =tanθ+sinθ/tanθsinθ 已知sin(A+B)=3/5,sin(A-B)=1/5,证明：tan A=2tan B. 求解 已知 sin(a+b)=1/2 ,sin(a_b)=1/3,求证:tan a=5tan b求解:已知 sin(a+b)=1/2 ,sin(a_b)=1/3,求证:tan a=5tan b 已知tan^2 a=2tan^ B +1,求证sin^2 b=sin^2 a -1 已知tan^2A=2tan^B+1求证sin^2B=2sin^2A-1救急 已知tan^2a=2tan^2b+1,求证:sin^b=2sin^2a-1 已知tan²a=2tan²b+1,求证sin²b=2sin²a-1 已知tan^2A=2tan^B+1,求证sin^2B=2sin^2A-1 已知sin^2B=2sin^2A-1求证tan^2A=2tan^B+1 已知tan²a=2tan²B+1,求证sin²B+1=2sin²a 已知tan²a=2tan²b+1,求证sin²b+1=2sin²a 已知(tan^2)a=2(tan^2)B+1,求证：(sin^2)B=2(sin^2)A-1