Mathematics
Senior High
余弦定理でこの計算になったのですが、答えが合わなくて計算の過程教えてほしいです。答えは2分の√3です。
CosG=
{ (1 + √5) k } ² + 4 k ² - 2 k
2. (1+55) k⋅ 2 k
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