I have been solving for a long time but in my answer my LHS is not equal to RHS....therefore pls help me....
Last edited by Sanjana Das; September 30th 2009 at 10:35 AM.
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do not solve plss its a totally wrong quest.
corrected question I have been solving for a long time but in my answer my LHS is not equal to RHS....therefore pls help me....
No need to solve i have solved............
You have Now simplify the left side by formula left side and transform Now estimate the sum . If , then . Since the cosine function in the interval positive and negative in , it follows that , ie you have Thus, the initial equality is proved.
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