(1+sinθ+cosθ)/(sin θ/2+cosθ/2)
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(1+sinθ+cosθ)/(sin θ/2+cosθ/2)
(1+sinθ+cosθ)/(sin θ/2+cosθ/2)
(1+sinθ+cosθ)/(sin θ/2+cosθ/2)
(1+sinθ+cosθ)/[sin(θ/2)+cos(θ/2)]
=[2cos²(θ/2)+2sin(θ/2)cos(θ/2)]/[sin(θ/2)+cos(θ/2)]
=2cos(θ/2)[sin(θ/2)+cos(θ/2)]/[sin(θ/2)+cos(θ/2)]
=2cos(θ/2)
求证:(1+cosθ+cosθ/2) /(sinθ+sinθ/2)=sinθ/1-cosθ
求证:(1+sinθ-cosθ)/(1+sinθ+cosθ)=sinθ/(cosθ+1)
化简:1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ
求证(1-sinθcosθ)除以(cos^2θ-sin^2θ)=(cos^2θ-sin^2θ)除以(1+2sinθcosθ)
化简【1+sinθ-cosθ/1+sinθ+cosθ】+cot(θ/2)
求证sinθ/(1+cosθ)+(1+cosθ)/sinθ=2/sinθ
(1+sinθ+cosθ)/(sin θ/2+cosθ/2)
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化简[sinθ(1+sinθ)+cosθ(1+cosθ)]*[sinθ(1-sinθ)+cosθ(1-cosθ)]-sin2θ
求证 【sinθ(1+sinθ)+cosθ(1+cosθ)】×【sinθ(1-sinθ)+cosθ(1-cosθ)】=sin2θ
sin(cosθ)是不是sin乘以cosθ呀
1-cosθ/(2sinθ/2)