maths c3 urgent

Mark scheme:

Question: http://pmt.physicsandmathstutor.com/download/Maths/A-level/C3/Papers-Edexcel/June%202014%20QP%20-%20C3%20Edexcel.pdf
Page 11 Q7b

http://pmt.physicsandmathstutor.com/download/Maths/A-level/C3/Papers-Edexcel/June%202014%20MS%20-%20C3%20Edexcel.pdf
Page 20 7b

I literally do not understand what's going on??? Surely it should be cot(2x+5) = root 3 then go from there? Why isn't there '+5'? Please help

There is meant to be a plus 5 and you are doing it right, if you follow through you should get tge answer in the mark scheme; the only reason that the mark scheme says '+...' is because it means that you an still get the first few method marks for making a mistake and writing +10, for example