求证:sin^2θtanθ+cos^2θcotθ+2sinθcosθ=tanθ+cotθ

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) 数学求证：sin2θ+sinθ/2cosθ+2sin²θ+cosθ=tanθ 若θ,α为锐角,且tanθ=(sinα-cosα)/(sinα+cosα)求证sinα-cosα=根号2sinθ 若θ,α为锐角,且tanθ=(sinα-cosα)/(sinα+cosα)求证sinα-cosα=根号2sinθ 若а,θ为锐角,且tanθ=(sinа-cosа)/(sinа+cosа),求证:sinа-cosа=√2sinθ 求证(sinθ+cosθ-1)(sinθ-cosθ+1)/sin2θ=tanθ/2 求证 (sinθ+cosθ-1)(sinθ-cosθ+1)) /sin2θ=tanθ/2 当α β是锐角tanθ=sinα -cosα / sinα + cosα 求证sinα -cosα=根号2sinθ 已知(sin^2α/sin^2β)+cos^2αcos^2θ=1,求证tan^2α=sin^2θtan^2β 求证:sin^2θtanθ+cos^2θcotθ+2sinθcosθ=tanθ+cotθ 求证(tan(2π-θ)sin(2π-θ)cos(6π-θ))/((-cosθ)sin(5π+θ))=tanθ 求证：sin2θ+sinθ/2cos2θ+2sin^2θ+cosθ=tanθ 求证[1]1-2sin acos a/cos²a -sin²a =1-tan a/1+tan a.[2]1-cos 2θ/1+cos 2θ=tan²θ 求证：[2sin(θ-3π/2)cos(θ+π/2)-1]/1-2sin^2 θ=[tan(9π+θ)+1]/tanθ-1 求证:sin^2/(sin-cos) - (sin+cos)/(tan^2 -1) =sin+cos 求证sinθ（1+tanθ)+cosθ(1+1/tanθ)=1/sinθ+1/cosθ 化简:cos^2θcotθ+sin^2θtanθ+2cosθsinθ