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| Question 1171764:  y1 =2cos(x)
 (i)Constructive interference(y1 + y2 = 2y1)
 (ii)destructive interference(y1 + y2 = 0)
 (iii) creates beats(y1 + y2 ,k1 ≠ k2)
 Answer by ikleyn(52879)
      (Show Source): 
You can put this solution on YOUR website! . 
 
(i)   Take y2 = 2cos(x)   (the same as y1)
(ii) Take y2 = -2cos(x)   (opposite to y1)
(iii)  Regarding k1, k2, I do not understand their meaning,
since they are not defined in the post - and, therefore, can not answer.
 In part (iii),  your post does not look like as a  Math problem.
 
 
 In whole,  the problem in  (i)  and in  (ii)  is as if you want to ask,
 how many is  1 + 1,  or how many is  1 - 1,  dressing it up in different smart words.
 
 
 
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