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This question gives us a general trick/method which can be used whenever we have some coefficients in the angle term of cos...x,2x,3x,....,(n+1)x The answer has been posted as a comment. |
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3 comments:
Hehe...
I have not posted it..Try it first ...dont give up
Click on the following link to see the answer
http://bp3.blogger.com/_gl3JZFZQq-4
/R7Fq_21p0qI/AAAAAAAAABM/HBRrh3uh5ns/
s1600-h/displayImageServlet.jpg
The link should be copied in the url box as one unit
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