2倍角の公式、半角の公式が得られる過程を教えてください🙇♀️
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787304411&Signature=F9fTp7TUBAvkfPdCu3iLXP~qtZnQGz~b3HNPxvOBsx9HPjYKW0MY6hCx2I2TZVxbrk3y7mu6cewaXj~wqHlpFE28j~0JEWbbRnRHpVq96fEX0Fm7o4O3C2DfkARaWSaMFEbu3r8dVomIHxd9FGDLqwl4yDdXfevRoivzRhWgi9IPIDHM06LfRmARBicnhI9s8Z4uQKFXkuBMOeCKayEzDnanTCKkNn4~g-lGqeVOOAP30RNFLjlDeGZiFBpDsVk33OGQmELyTYSuoa5~Pl~P44-3FHsqqXi6PlUkLsad7La4SGQ9rfR0Ofy77TtWrHwwaYi~g5MTBOpsjVpsM3qfnQ__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787304411&Signature=baPhSz4R7U-G-pU5yuDLbBhcLTyP0hHxTpQaOnSj4whdUgkRH53Mvgwn9rC-VPSpWFpdgAKRUzC2UTXZFpOBnvHD5b6nFA8~YE3Zo0pmCxk4bMd4C~hr7Eu3JRtr84AkJSbdtbxsw-DA5YUuzyVJ9S-pH6xZiCDv2i8MESUub2K0QdejRK4gPTAee-vaO7aklYOlf5NexNcS82HQnDyX~BgYo3tKWl5boLS3UtDrPzIsJLoyZ6I10UH~FgZhXht4gzWPtuZGdTL2y8qHncWQAf2xAf0AlY2jsnPjcACLUBGjl56lTC3vmu7hJ9euEHLlyAvpkQl61u9-P1kp7sjOaw__&Key-Pair-Id=K2W722D70GJS8W)
