cos 96o + sin 96o
tan 19No = -----------------
           cos 96o - sin 96o

  LS= -0.809784 approx.   

arctan(19N)= arctan( -0.809784 )=-31^o +N*180^o

^{This angle should be divisible by 19}

for k=17 it is  3021

LS=RS= -0.809784 approx.

so the answer is N  =   3021/19= 159 

Edited on November 16, 2014, 3:36 pm

Posted by Ady TZIDON on 2014-11-16 11:01:54