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[" 3."int(0)^( pi/2)(dx)/(4+5cos^(2)x)=]...

[" 3."int_(0)^( pi/2)(dx)/(4+5cos^(2)x)=],[[" 1) "(pi)/(12),," 2) "(1)/(6)tan^(-1)((1)/(2))],[" 3) "(1)/(12)log((3)/(5))," 4) "4 pi]]

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