{"id":952,"date":"2025-11-21T17:24:17","date_gmt":"2025-11-21T08:24:17","guid":{"rendered":"http:\/\/saegil-lab.kr\/?p=952"},"modified":"2026-03-11T19:33:30","modified_gmt":"2026-03-11T10:33:30","slug":"%ec%82%bc%ea%b0%81%ed%95%a8%ec%88%98-fx-sin-x%ec%9d%98-%eb%af%b8%eb%b6%84","status":"publish","type":"post","link":"https:\/\/saegil-lab.kr\/?p=952","title":{"rendered":"\uc0bc\uac01\ud568\uc218 f(x) = sin x \uc758 \ubbf8\ubd84"},"content":{"rendered":"\n

<\/p>\n\n\n\n

  <\/span>   <\/span>\"\[ f(x) = \sin x\]\"<\/p><\/p>\n\n\n\n

  <\/span>   <\/span>\"\begin{align*}f'(x) &= (\sin x)' = \lim_{h \rightarrow 0} \frac{\sin(x+h) - \sin(x-h)}{2h} \\&= \lim_{h \rightarrow 0} \frac{(\sin x \cos h + \cos x \sin h) - (\sin x \cos h - \cos x \sin h) }{2h} \\&= \lim_{h \rightarrow 0} \frac{2 \cos x \sin h}{2h} \\&= \cos x \times \lim_{h \rightarrow 0}\frac{\sin h}{h} \\&= \cos x\end{align*}\"<\/p><\/p>\n\n\n\n

\uc5ec\uae30\uc11c \uc0ac\uc6a9\ud55c \uacf5\uc2dd\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n\n\n\n

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

  <\/span>   <\/span>\"\[ \lim_{h \rightarrow 0} \frac{\sin h}{h} = 1 \]\"<\/p><\/p>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

        \uc5ec\uae30\uc11c \uc0ac\uc6a9\ud55c \uacf5\uc2dd\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.        <\/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":[75,73],"class_list":["post-952","post","type-post","status-publish","format-standard","hentry","category-13","tag-sin-x-","tag-73"],"_links":{"self":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/952","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=952"}],"version-history":[{"count":7,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/952\/revisions"}],"predecessor-version":[{"id":970,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=\/wp\/v2\/posts\/952\/revisions\/970"}],"wp:attachment":[{"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/saegil-lab.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}