[" 69.The value of "int(-oo)^( pi)(cos^(...

[" 69.The value of "int_(-oo)^( pi)(cos^(2)x)/(1+a^(4))dx,a>0" ,is "],[[" (a) "pi," (b) "a pi," (c) "(pi)/(2)," (d) "2 pi]]

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