证明1-2cos^2θ/tanθ-cotθ=sinθcosθ
证明1-2cos^2θ/tanθ-cotθ=sinθcosθ
化简:cos^2θcotθ+sin^2θtanθ+2cosθsinθ
sinθ-cosθ=1/2,则tanθ+cotθ=
sinΘ-cosΘ=1/2,求tanΘ+cotΘ
求证:sin^2θtanθ+cos^2θcotθ+2sinθcosθ=tanθ+cotθ
已知sinθ+cosθ=√2,则tanθ+cotθ=?
已知tanθ+cotθ=2,求sin^3θ-cos^3θ的值
证明tanθ×((1-sinθ)/(1+cosθ))=cotθ×((1-cosθ)/(1+sinθ))
求证[tanθ·(1-sinθ)]/1+cosθ=[cotθ·(1-cosθ)]/1+sinθ
证明下列恒等式(sinθ+cosθ)/(1-tan^2θ)+sin^2θ/(sinθ-cosθ)=sinθ+cosθ
有道数学题帮下忙cot(sinθ)*tan(cosθ)
证明tanα-cotα=(1-2cos^2α)/(sinαcosα)