삼각함수 그래프 특징

array(10) { [0]=> object(stdClass)#4418 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "n8dsNx3GSI8" ["related_video_title"]=> string(25) "삼각함수의 그래프" ["posted_time"]=> string(19) "9 лет назад" ["channelName"]=> string(12) "수악중독" } [1]=> object(stdClass)#4391 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "DTKyrAyLWb8" ["related_video_title"]=> string(124) "삼각비부터 삼각함수까지 제대로 정리해드립니다 | sin(사인), cos(코사인), tan(탄젠트) | 호도법" ["posted_time"]=> string(19) "1 год назад" ["channelName"]=> string(16) "영수의 본질" } [2]=> object(stdClass)#4416 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "fGIr40IXW_g" ["related_video_title"]=> string(58) "삼각함수 6강: 일반각에 대한 삼각함수 성질" ["posted_time"]=> string(19) "5 лет назад" ["channelName"]=> string(12) "진쌤수학" } [3]=> object(stdClass)#4423 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "4t98YqHijuI" ["related_video_title"]=> string(76) "삼각함수의 미분, 적분, 우프 선생, 2024년 1월 14일, 일요일" ["posted_time"]=> string(63) "Трансляция закончилась 1 год назад" ["channelName"]=> string(22) "우프 사이버스쿨" } [4]=> object(stdClass)#4402 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "gn4zKBULDVA" ["related_video_title"]=> string(22) "15강 행렬의 정의" ["posted_time"]=> string(25) "4 месяца назад" ["channelName"]=> string(8) "수학NG" } [5]=> object(stdClass)#4420 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "onDppfWPQHI" ["related_video_title"]=> string(86) "나도 모르게 수포자가 되어가는 문제집 | 초등 수학 문제집 추천" ["posted_time"]=> string(23) "5 часов назад" ["channelName"]=> string(35) "라비쌤 - 하위권 돌파 수학" } [6]=> object(stdClass)#4415 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "52yhBkkulXw" ["related_video_title"]=> string(30) "Математик и черт" ["posted_time"]=> string(20) "13 лет назад" ["channelName"]=> string(8) "SerCtrlX" } [7]=> object(stdClass)#4425 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "blWdjRUPP6E" ["related_video_title"]=> string(72) "Разведчик о том, как использовать людей" ["posted_time"]=> string(23) "1 месяц назад" ["channelName"]=> string(18) "Коллектив" } [8]=> object(stdClass)#4401 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "2C8zYFArnKY" ["related_video_title"]=> string(121) "Самая холодная деревня в мире (Это видео стоило мне здоровья) -71°C" ["posted_time"]=> string(21) "1 день назад" ["channelName"]=> string(11) "Ruhi Çenet" } [9]=> object(stdClass)#4419 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "S9lzm7pXK4A" ["related_video_title"]=> string(119) "Минобороны РФ заявило о победе / Это не должно было попасть в эфир" ["posted_time"]=> string(23) "7 часов назад" ["channelName"]=> string(12) "NEXTA Moment" } }