Question: hello i am solving a practice question from the book, but i don't understand how the answer is gotten. this is the question Determine two

hello i am solving a practice question from the book, but i don't understand how the answer is gotten.

this is the question

Determine two coterminal angles (one positive and one negative) for each angle.

9PI/4

the answer is PI/4 , 7PI/4 <---------- how did we get those two answers. should i use a calculator for this or not ?

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