Additional math 0606 doubt please help very urgent...

[sj0007]

http://papers.xtremepapers.com/CIE/...matics - Additional (0606)/0606_s13_qp_11.pdf
Last question last part how to get 157.5.....is it by taking two basic angles???
Thanx in advance!!!

 

[Harry James Potter]

You substitute cot y with (tan y)^-1 , and start from there.