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[" 34."lim(n rarr oo)sum(k=1)^(n)(sin(pi...

[" 34."lim_(n rarr oo)sum_(k=1)^(n)(sin(pi)/(2k)-cos(pi)/(2k)-sin((pi)/(2(k+2)))+cos(pi)/(2(k+2)))=],[[" (a) "0," (b) "1],[" (c) "2," (d) "3]]

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