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602(2): 02/02(日)08:48 ID:YcDU0581(3/7) AAS
dy/dθ=Rcos(α/2)((2π/α)cos(2πθ/α)cos(α/2-θ)-sin(2πθ/α)sin(α/2-θ))/cos^2(α/2-θ)=0
(2π/α)cos(2πθ/α)cos(α/2-θ)=sin(2πθ/α)sin(α/2-θ)
α=2π/3
3cos3θcos(π/3-θ)=sin3θsin(π/3-θ)
うーん

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604(2): 02/02(日)12:19 ID:YcDU0581(4/7) AAS
>>602
>3cos3θcos(π/3-θ)=sin3θsin(π/3-θ)
t=π/3-θ
3θ=π-3t
3cos(π-3t)cost=sin(π-3t)sint
-3cos3tcost=sin3tsint
3cos3tcost+sin3tsint=0
省16

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610: 02/02(日)15:04 ID:YcDU0581(7/7) AAS
>>602
>(2π/α)cos(2πθ/α)cos(α/2-θ)=sin(2πθ/α)sin(α/2-θ)
t=α/2-θ
2πθ/α=π-2πt/α
(2π/α)cos(π-2πt/α)cost=sin(π-2πt/α)sint
(2π/α)cos(2πt/α)cost+sin(2πt/α)sint=0
(2π/α)(cos(2π/α+1)t+cos(2π/α-1)t)+cos(2π/α-1)t)-cos(2π/α+1)t=0
省8

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