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[" 17"7 pi{(36)/(12)tan[(1)/(2)sin^(-1)(...

[" 17"7 pi{(36)/(12)tan[(1)/(2)sin^(-1)(2x)/(1+x^(2))+(1)/(2)cos^(-1)(1-x^(2))/(1+x^(2))]=?],[[" (a) "oo," (b) "1],[" (c) "(2x)/(1-x^(2))," (d) "(2x)/(1+x)]]

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