hello Please can someone advise me. I’m private tutoring a Higher level student and apart from a AQA Spec document I have no other means of gleaning info apart from the internet. I am wondering whether I need to teach my student how to work out exact trig values in all the 4 quadrants eg sin 225, cos 330 etc etc. The AQA Spec just says up to 90 degrees. However Corbettmaths worksheets has questions on other quadrants. Thanks very much . Help greatly appreciated.