求证tan^2θ-sin^2θ=tan^2θsin^2θ

求证tan^2θ-sin^2θ=tan^2θsin^2θ 求证2(cosθ -sinθ )/1+sinθ +cosθ =tan(π/4-θ /2)-tanθ /2 求证：2（cos θ -sin θ )/(1+sinθ +cosθ)=tan(∏/4- θ /2)-tan(θ /2) 已知tanθ+sinθ=a,tanθ-sinθ=b,求证(a2-b2)2=16ab 求证 tanθ(1+sinθ )+sinθ /tanθ (1+sinθ )-sinθ =tanθ+sinθ/tanθsinθ 求证（1）1+tanθ/1-tanθ=tan(π/4+θ) （2）1-tanθ/1+tanθ=tan(π/4-θ） 已知tan^2θ=2tan^2a+1,求证:cos2θ+sin^2a=0 已知tan^2θ=2tan^2a+1,求证:cos2θ+sin^2a=0 tan²α=2tan²θ+1求证cos2α+sin²θ=0 数学的求证题已知tanθ+sinθ=a,tanθ-sinθ=b求证：（a^2-b^2)^2=16ab 求证tan^2asin^2a=tan^2a-sin^2a求证tan^2 a 乘 sin^2 a=tan^2 a-sin^2 a 已知(sin^2α/sin^2β)+cos^2αcos^2θ=1,求证tan^2α=sin^2θtan^2β 已知tan(α-γ)/tanα+sin^2β/sin^2α=1,求证:tan^2β=tanαtanγ 求证：tan²θ-sin²θ=tan²θ·sin²θ 求证tan^2α-sin^2α=tan^2α*sin^2α 求证tan^x-sin^2x=tan^2x*sin^2x 求证:tan^2α-sin^α=tan^2乘sin^2α 求证:(sinα+tanα*tanα/2+cosα)*sinα/2cosα=tanα