什麼是極限

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=ml0ezH8_wmY

這部影片從古典的切線問題切入，談論極限(limit)的概念及極限在微積分中所扮演的關鍵角色。另外，本影片也嘗試解釋什麼是單邊極限(左極限、右極限)，什麼是雙邊極限。最後再利用極限理論當中的替代定理，將古典的切線問題做出一個答覆。","styleRuns":[{"startIndex":0,"length":116,"styleRunExtensions":{"styleRunColorMapExtension":{"colorMap":[{"key":"USER_INTERFACE_THEME_DARK","value":4294967295},{"key":"USER_INTERFACE_THEME_LIGHT","value":4279440147}]}},"fontFamilyName":"Roboto"}]},"headerRuns":[{"startIndex":0,"length":116,"headerMapping":"ATTRIBUTED_STRING_HEADER_MAPPING_UNSPECIFIED"}]}},{"itemSectionRenderer":{"contents":[{"continuationItemRenderer":{"trigger":"CONTINUATION_TRIGGER_ON_ITEM_SHOWN","continuationEndpoint":{"clickTrackingParams":"CK0BELsvGAIiEwjYlMmOwe-LAxXN50IFHVWsM2g=","commandMetadata":{"webCommandMetadata":{"sendPost":true,"apiUrl":"/youtubei/v1/next"}},"continuationCommand":{"token":"Eg0SC21sMGV6SDhfd21ZGAYyJSIRIgttbDBlekg4X3dtWTAAeAJCEGNvbW1lbnRzLXNlY3Rpb24%3D","request":"CONTINUATION_REQUEST_TYPE_WATCH_NEXT"}}}}],"trackingParams":"CK0BELsvGAIiEwjYlMmOwe-LAxXN50IFHVWsM2g=","sectionIdentifier":"comment-item-section","targetId":"comments-section"}}],"trackingParams":"CKwBELovIhMI2JTJjsHviwMVzedCBR1VrDNo"}},"secondaryResults":{"secondaryResults":{"results":[{"compactVideoRenderer":{"videoId":"QsG7MD7vUww","thumbnail":{"thumbnails":[{"url":"https://i.ytimg.com/vi/QsG7MD7vUww/hqdefault.jpg?sqp=-oaymwEbCKgBEF5IVfKriqkDDggBFQAAiEIYAXABwAEG 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