{"id":1154,"date":"2025-11-27T17:08:38","date_gmt":"2025-11-27T08:08:38","guid":{"rendered":"http:\/\/saegil-lab.kr\/?p=1154"},"modified":"2026-03-11T19:31:19","modified_gmt":"2026-03-11T10:31:19","slug":"%ec%82%bc%ea%b0%81%ed%95%a8%ec%88%98%ec%9d%98-%eb%8d%a7%ec%85%88%ec%a0%95%eb%a6%ac-%eb%ba%84%ec%85%88%ec%a0%95%eb%a6%ac2","status":"publish","type":"post","link":"https:\/\/saegil-lab.kr\/?p=1154","title":{"rendered":"\uc0bc\uac01\ud568\uc218 \ub367\uc148\uc815\ub9ac, \ube84\uc148\uc815\ub9ac(2)"},"content":{"rendered":"\n

\uc624\uc77c\ub7ec\uc758 \uc2dd [link]<\/a><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[e^{ix} = \cos x + i \sin x \]\"<\/p><\/p>\n\n\n\n

\uc704\uc758 \uc2dd\uc5d0\uc11c \"x\"\ub300\uc2e0 \"\alpha + \beta\"\ub97c \uc785\ub825\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \uc4f8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ e^{i(\alpha + \beta)} = e^{i \alpha} e^{i \beta} = \cos (\alpha + \beta) + i \sin(\alpha + \beta) \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\begin{equation*}\begin{aligned}e^{i \alpha } e^{i \beta} &= (\cos \alpha + i \sin \alpha )(\cos \beta + i \sin \beta) \\& = \cos \alpha \cos \beta + i \cos \alpha \sin \beta + i \sin \alpha \cos \beta - \sin \alpha \sin \beta \\& = (\cos \alpha \cos \beta - \sin \alpha \sin \beta ) + i (\sin \alpha \cos \beta + \cos \alpha \sin \beta)\end{aligned}\end{equation*}\"<\/p><\/p>\n\n\n\n

\ub530\ub77c\uc11c \uc0bc\uac01\ud568\uc218\uc758 \ub367\uc148\uc815\ub9ac\ub97c \uc5bb\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos(\alpha + \beta) = \cos \alpha \cos \beta - \sin \alpha \sin \beta \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin(\alpha + \beta) = \sin \alpha \cos \beta + \cos \alpha \sin \beta \]\"<\/p><\/p>\n\n\n\n

\uc717 \uc2dd\uc5d0 \"\beta\"\ub300\uc2e0 \"-\beta\"\ub97c \uc785\ub825\ud558\uba74 \ube84\uc148\uc815\ub9ac\ub97c \uc5bb\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos(\alpha - \beta) = \cos \alpha \cos \beta + \sin \alpha \sin \beta \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin(\alpha - \beta) = \sin \alpha \cos \beta - \cos \alpha \sin \beta \]\"<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

\uc624\uc77c\ub7ec\uc758 \uc2dd [link]     \uc704\uc758 \uc2dd\uc5d0\uc11c \ub300\uc2e0 \ub97c \uc785\ub825\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 \uc4f8 \uc218 \uc788\ub2e4.         \ub530\ub77c\uc11c \uc0bc\uac01\ud568\uc218\uc758 \ub367\uc148\uc815\ub9ac\ub97c \uc5bb\uc744 \uc218 \uc788\ub2e4.         \uc717 \uc2dd\uc5d0 \ub300\uc2e0 \ub97c \uc785\ub825\ud558\uba74 \ube84\uc148\uc815\ub9ac\ub97c \uc5bb\uc744 \uc218 \uc788\ub2e4.     … \uacc4\uc18d \uc77d\uae30 →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[89,88],"class_list":["post-1154","post","type-post","status-publish","format-standard","hentry","category-13","tag-89","tag-88"],"_links":{"self":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/1154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1154"}],"version-history":[{"count":13,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/1154\/revisions"}],"predecessor-version":[{"id":1180,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/1154\/revisions\/1180"}],"wp:attachment":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1154"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}