If you need more explanations before the quiz, here are some good videos to watch...but make sure you still practice afterwards.
simplifying trig expressions
Dr Burger
https://www.youtube.com/watch?v=GFbYHRMraKE
Sal from Khan
https://www.youtube.com/watch?v=4OEeVLo5V1o
fundamental trig identity explanantion -some guy
https://www.youtube.com/watch?v=I4mcja8abDc
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