三角比的延伸定義 | General Definitions of Trigonometric Ratios

[@IDENTITYHK]

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影片內容：
01:32 - 旋轉角與象限 | angles of rotation and quadrants
05:45 - 同界角 | coterminal angles
07:38 - 任何角度的三角比 | trigonometric ratios of any angle
16:09 - 特殊角的三角比 (利用單位圓解釋) | trigonometric ratios of special angles (explained with unit circle)
Playlist：
HKDSE Maths | 續三角比 | More about Trigonometric Ratios
ua-cam.com/play/PL1Pv0-rhcQx6bH3AYTdc-wN143DjIJhYK.html

[@chauyuenleung1503]

很详細~感謝你的video ❤

[@tsoisam3313]

thank you so much !

[@christywong2588]

講解得非常好。謝謝分享

[@SimpleJoshTense]

10:32 Sorry but why is the value of theta different among the three ratios?

[@leeleonie2094]

omg THANK YOU!
you save my life！！！！！！！！！！！！！！！！！！！！！1