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[int(0)^( pi/4)(sec x)/(1+2sin^(2)x)dx=]...

[int_(0)^( pi/4)(sec x)/(1+2sin^(2)x)dx=],[" (a) "(1)/(3)[log(sqrt(2)+1)+(pi)/(2sqrt(2))]],[" (b) "(1)/(3)[log(sqrt(2)+1)-(pi)/(2sqrt(2))]],[" (c) "3[log(sqrt(2)+1)-(pi)/(2sqrt(2))]],[" (d) "3[log(sqrt(2)+1)+(pi)/(2sqrt(2))]]

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