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球面三角法§’の余弦則 cos 𝐴= −cos 𝐵cos 𝐵+ sin 𝐵sin 𝐵cos 𝑎 cos 𝐵= −cos 𝐵cos 𝐴+ sin 𝐵sin 𝐴cos 𝑏 cos 𝐵= −cos 𝐴cos 𝐵+ sin
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