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Find the sum of the question

Find the sum of the question 

Grade:12

2 Answers

noogler
489 Points
6 years ago
where is the question???????????????
 
plz post ur question again :-)
aakanksha
40 Points
6 years ago
the question is:
cos(thita)+ 22cos(2thita)+ 32cos(3thita)+..........+ n2cos(nthita) = 

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