How to get correct answer

mimie

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May 21, 2019
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I only manage to get one of the answer correct which is 32°30' but unable to get 191°6' as another answer. Can someone teach me how to get 191°6'? Thanks.
 
Don't reject your second answer of theta/2 = -84o 27'.
This leads to theta = -168o54'.
Now this is outside the domain given, but what is an angle coterminal with this one which IS in the domain? (hint: add 360o)
 
I don't understand why cannot reject -84°27', can you explain it in simple words?
 
Because at that stage you haven't yet found theta. When you get theta = -168o54', you 'reject' that answer but find an angle in your domain that is coterminal with it ie -168o54' + 360o.
 
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