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  3. hi with prep 3 and 4 im wondering why they...

Question: hi with prep 3 and 4 im wondering why they...

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Hi, with Prep 3 and 4 I'm wondering why they don't use the 2nd reference angle 7pi/12 but instead where do they get the -5pi/12 for their 2nd answer? Kind of the same with Prep 4... i can get the pi/4 but not sure about the rest of the answer. The answers for Prep 3 is -5π12 + nπ, 5π12+ nπ and for Prep 4 it is π4+3

thanks very much, Michael

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