{"id":1165,"date":"2025-11-28T16:39:26","date_gmt":"2025-11-28T07:39:26","guid":{"rendered":"http:\/\/saegil-lab.kr\/?p=1165"},"modified":"2026-03-06T15:45:46","modified_gmt":"2026-03-06T06:45:46","slug":"%ec%82%bc%ea%b0%81%ed%95%a8%ec%88%98%ec%9d%98-%ec%97%ac%eb%9f%ac-%ea%b3%b5%ec%8b%9d","status":"publish","type":"post","link":"https:\/\/saegil-lab.kr\/?p=1165","title":{"rendered":"\uc0bc\uac01\ud568\uc218\uc758 \uc5ec\ub7ec \uacf5\uc2dd"},"content":{"rendered":"\n

\uc0bc\uac01\ud568\uc218\uc758 \ub367\uc148 \ube84\uc148 \uacf5\uc2dd – [link1]<\/a> [link2]<\/a><\/p>\n\n\n\n

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

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

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

2\ubc30\uac01 \uacf5\uc2dd<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin 2\alpha = 2\sin \alpha \cos \alpha \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\begin{equation*}\begin{aligned}\cos 2\alpha &= \cos^2 \alpha - \sin^2 \alpha \\&= 1-2\sin^2 \alpha \\&= 2\cos^2 \alpha - 1\end{aligned}\end{equation*}\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \tan 2\alpha = \frac{2\tan \alpha}{1 - \tan^2 \alpha} \]\"<\/p><\/p>\n\n\n\n

\"\cos 2\alpha = 1-2\sin^2 \alpha = 2 \cos^2 \alpah -1\"\uc5d0\uc11c \"\sin^2 \alpha\", \"\cos^2 \alpha\"\ub97c \uad6c\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin^2 \alpha = \frac{1-\cos 2\alpha}{2}\]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos^2 \alpha = \frac{1+ \cos 2\alpha}{2} \]\"<\/p><\/p>\n\n\n\n

\ubc18\uac01 \uacf5\uc2dd<\/p>\n\n\n\n

\uc704\uc758 \uacf5\uc2dd\uc5d0\uc11c \"\alpha\" \ub300\uc2e0 \"\frac{\alpha}{2}\"\ub97c \ub300\uc785\ud558\uba74 \ubc18\uac01 \uacf5\uc2dd\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin^2 \frac{\alpha}{2} = \frac{1-\cos \alpha}{2}\]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos^2 \frac{\alpha}{2} = \frac{1+\cos \alpha}{2}\]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \tan^2 \frac{\alpha}{2} = \frac{\sin^2 \frac{\alpha}{2}}{\cos^2 \frac{\alpha}{2}} = \frac{1-\cos \alpha}{1+ \cos \alpha} \]\"<\/p><\/p>\n\n\n\n

\uc0bc\uac01\ud568\uc218\uc758 \ub367\uc148\uacf5\uc2dd\uacfc \ube84\uc148\uacf5\uc2dd\uc758 \ud569\uacfc \ucc28\ub97c \uc774\uc6a9\ud558\uba74 \ub450 \uc0bc\uac01\ud568\uc218\uc758 \uacf1\uc744 \uc0bc\uac01\ud568\uc218\uc758 \ud569\uacfc \ucc28\ub85c \ubcc0\ud615\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin \alpha \cos \beta = \frac{1}{2} \{ \sin(\alpha + \beta) + \sin (\alpha - \beta)\} \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos \alpha \sin \beta = \frac{1}{2} \{ \sin(\alpha + \beta) - \sin (\alpha - \beta)\} \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos \alpha \cos \beta = \frac{1}{2} \{\cos(\alpha + \beta) + \cos (\alpha - \beta)\} \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin \alpha \sin \beta = -\frac{1}{2} \{\cos(\alpha + \beta) - \cos (\alpha - \beta)\} \]\"<\/p><\/p>\n\n\n\n

\uc0bc\uac01\ud568\uc218\uc758 \ub367\uc148\uacf5\uc2dd\uacfc \ubef4\uc148\uacf5\uc2dd\uc5d0\uc11c \"\alpha + \beta = {\rm A}\", \"\alpha - \beta = \rm{B}\"\ub77c\uace0 \ud558\uba74 \"{\alpha = \rm \frac{A+B}{2}\", \"{\beta = \rm \frac{A-B}{2}\"\ub85c \ud45c\uc2dc\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \ub2e4\uc74c\uacfc \uac19\uc774 \uc0bc\uac01\ud568\uc218\uc758 \ud569, \ucc28\ub97c \uc0bc\uac01\ud568\uc218\ub4e4\uc758 \uacf1\uc73c\ub85c \ubcc0\ud615\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin {\rm A} + \sin {\rm B} = \rm 2 \sin \frac{A+B}{2} \cos \frac{A-B}{2} \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \sin {\rm A} - \sin {\rm B} = \rm 2 \cos \frac{A+B}{2} \sin \frac{A-B}{2} \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos {\rm A} + \cos {\rm B} = \rm 2 \cos \frac{A+B}{2} \cos \frac{A-B}{2} \]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ \cos {\rm A} - \cos {\rm B} = - \rm 2 \sin \frac{A+B}{2} \sin \frac{A-B}{2} \]\"<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

\uc0bc\uac01\ud568\uc218\uc758 \ub367\uc148 \ube84\uc148 \uacf5\uc2dd – [link1] [link2]                 2\ubc30\uac01 \uacf5\uc2dd             \uc5d0\uc11c , \ub97c \uad6c\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.         \ubc18\uac01 \uacf5\uc2dd \uc704\uc758 \uacf5\uc2dd\uc5d0\uc11c \ub300\uc2e0 \ub97c \ub300\uc785\ud558\uba74 … \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":[91,92,94,90,93],"class_list":["post-1165","post","type-post","status-publish","format-standard","hentry","category-13","tag-2-","tag-92","tag-94","tag-90","tag-93"],"_links":{"self":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/1165","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=1165"}],"version-history":[{"count":13,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/1165\/revisions"}],"predecessor-version":[{"id":1184,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/1165\/revisions\/1184"}],"wp:attachment":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1165"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1165"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1165"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}