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OpenStudy (anonymous):
plz help .question following
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OpenStudy (mertsj):
Question: What is the question?
OpenStudy (anonymous):
Find the values of x for which the series converges.Find the sum of the series for these values of x \[\sum_{0}^{\infty}cos^ n x\2^n]
OpenStudy (anonymous):
\[\sum_{0}^{\infty}cos^n x/2^n\] there is the series
OpenStudy (anonymous):
converges for all x since numerator is bounded by 1
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