By considering where , show that My attempt Let X be equal to the sum Now Rationalizing with numerator of Collecting the real terms which becomes Needless to say, I've hit a little snag, so help is politely requested.
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Originally Posted by I-Think By considering where , show that My attempt Let X be equal to the sum Now Rationalizing with numerator of Collecting the real terms which becomes Needless to say, I've hit a little snag, so help is politely requested. Note that which is a geometric series, with terms, and . So . Now convert this to real and imaginary parts and everything should fall into place.
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