((1+sinθ-cosθ)/(1+sinθ-cosθ))+ cot(θ/2)
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/27 09:51:19
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((1+sinθ-cosθ)/(1+sinθ-cosθ))+ cot(θ/2)
((1+sinθ-cosθ)/(1+sinθ-cosθ))+ cot(θ/2)
((1+sinθ-cosθ)/(1+sinθ-cosθ))+ cot(θ/2)
(1)令t=tan (θ/2)由万能公式sinθ=(2t)/(t^2+1) cosθ=(t^2-1)/(t^2+1)原式=(t^2+1+2t-t^2+1)/(t^2+1+2t+t^2-1)=(2t+2)/(2t^2+2t)=1/t=cot (θ/2)(2)令t=tan(3a/2) tan 3a=(2t)/(1-t^2)原式=t*(2t)/(1-t^2)+1=(2t^2+1-t^2)/(1-t^2)=(1+t^2)/(1-t^2)由万能公式 (1+t^2)/(1-t^2)=-1/cos(3a)=-sec(3a)
化简:1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ
麻烦下大家 sinθ+cosθ=7/5,且tanθ>1, 则cos θ= 由于基础不好请过程详细一点!3qsinθ+cosθ=7/5 (sinθ+cosθ)^2 = 49/25 1+ 2sinθcosθ = 49/25 2sinθcosθ = 24/25 1-2sinθcosθ=1/25 (sinθ-cosθ)^2 = 1/25 sinθ-cosθ = 1/5 或 si
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