簡介 Herman Yeung YouTube Channel

[@bds9121]

support 😊

[@OchingChan]

蒸蒸日上🎉

[@Yin0309]

好睇

[@hinting4655]

Herman Sir, 我重溫咗你先前core嘅sin law, cos law
條片有提過tan law ，但out c ，所以無講，但又想得個知字，可唔可以拍一拍介紹吓Tan Law

[@HermanYeung]

th-cam.com/video/-u0ctMjXJQc/w-d-xo.html