Good to see you are focused on the details. Use your calculator in the Radians mode and not degrees here when you are working with sin, cos, tan. The following link might help clear your doubt: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZE0AQiJ6_Tw.htmlsi=rvja9PEgn3X7dGnb