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Add.Math problem, please help me><,tomorrow is the exam

question:solve sec(z/3)=4 for 0<z<5 radians the answer is 3.96 and the range of z is still 0<z<5 i get the answer 3.96 and 14.9 but why the range of z is not 0<z<(5/3)? This question is pass year paper may/june 2010 (10.iii)
- Mark Cheah
- Thread
- Nov 7, 2012
- Replies: 0
- Forum: O-Levels / GCSEs / IGCSE

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