Mathematics
Senior High

サインの2倍角の問題がわかりません教えてください

ピン よる (は 関数ぁテ=cos2r一sinnx+了2cosx (OSテミミ) は cosァ(とおくと, ぁデ[(26 ) |だ+[(27)]。 -[(28) | と表きれる。

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