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[" 81."int(0)^( pi)(xdx)/(4cos^(2)x+9sin...

[" 81."int_(0)^( pi)(xdx)/(4cos^(2)x+9sin^(2)x)=],[[" 1) "(pi^(2))/(12)," 2) "(pi^(2))/(4)," 3) "(pi^(2))/(6)," 4) "(pi^(2))/(3)]]

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int_(0)^(pi)(x dx)/(4 cos^(2)x+9sin^(2)x)=

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