눈으로 보는 미분계수의 기하학적 의미

array(10) { [0]=> object(stdClass)#4169 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "6W657-SHH00" ["related_video_title"]=> string(52) "측정값으로 보는 극한(무리수 e의 정의)" ["posted_time"]=> string(21) "2 года назад" ["channelName"]=> string(9) "박일동" } [1]=> object(stdClass)#4142 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "ixGZ0tg_lqs" ["related_video_title"]=> string(48) "평균변화율과 순간변화율(미분계수)" ["posted_time"]=> string(19) "6 лет назад" ["channelName"]=> string(12) "수악중독" } [2]=> object(stdClass)#4167 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "ULSp1v2SuMo" ["related_video_title"]=> string(36) "제3-2강. 미분계수의 정의(2)" ["posted_time"]=> string(19) "5 лет назад" ["channelName"]=> string(16) "EBSi임재석쌤" } [3]=> object(stdClass)#4174 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "K-ITzPifkZ0" ["related_video_title"]=> string(49) "※30분 순삭※ 미분이 이렇게 쉬웠나?" ["posted_time"]=> string(28) "11 месяцев назад" ["channelName"]=> string(16) "김재하 수학" } [4]=> object(stdClass)#4153 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "NstqWsNG9-g" ["related_video_title"]=> string(132) "Ошибки на ДВИ МГУ, которые приводят к провалу на экзамене / Математик МГУ" ["posted_time"]=> string(22) "13 дней назад" ["channelName"]=> string(25) "Математик МГУ" } [5]=> object(stdClass)#4171 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "9MA60oNjBsM" ["related_video_title"]=> string(52) "(보충) 좌, 우미분계수의 기하학적 의미" ["posted_time"]=> string(21) "3 года назад" ["channelName"]=> string(12) "아이노더" } [6]=> object(stdClass)#4166 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "OC8wH5hixdM" ["related_video_title"]=> string(29) "도함수 기본개념 정리" ["posted_time"]=> string(21) "4 года назад" ["channelName"]=> string(12) "사오수학" } [7]=> object(stdClass)#4176 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "B1ULvYY-0Uo" ["related_video_title"]=> string(124) "Закон сохранения энергии — величайшее заблуждение физики [Veritasium]" ["posted_time"]=> string(21) "1 день назад" ["channelName"]=> string(10) "Vert Dider" } [8]=> object(stdClass)#4152 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "mYw_Pve7hYE" ["related_video_title"]=> string(61) "미분가능성과 연속성 처음 배우는 학생들에게" ["posted_time"]=> string(19) "1 год назад" ["channelName"]=> string(16) "김재하 수학" } [9]=> object(stdClass)#4170 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "r0TbE1_xAbs" ["related_video_title"]=> string(127) "Скандал! Депутат сказал правду о кризисе в экономике. Что было дальше?" ["posted_time"]=> string(24) "15 часов назад" ["channelName"]=> string(37) "Популярная политика" } }