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[" 2."int(-pi)^( pi)(2x(1+sin x))/(1+cos...

[" 2."int_(-pi)^( pi)(2x(1+sin x))/(1+cos^(2)x)=],[[" (A) "pi^(2)," (B) "(pi^(2))/(4)],[" (C) "(pi)/(8)," (D) "(pi^(2))/(8)]]

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