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Hi I have doubts in a problem the iitjee question paper 2012.I have attatched the question image. 1.In line 6 of the solution, why is 1/ 2 2.In line 7 how did we get 5π /6 and why are they adding 2π both the sides?

Hi
I have doubts in a problem the iitjee question paper 2012.I have attatched the question image.
 
1.In line 6 of the solution, why is
1/ 2
2.In line 7 how did we get 5π /6 and why  are they adding 2π both the sides?
 
 

Question Image
Grade:11

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