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[" 1."RA((pi)/(48)tan[(1)/(2)sin^(-1)(2x...

[" 1."RA((pi)/(48)tan[(1)/(2)sin^(-1)(2x)/(1+x^(2))+(1)/(2)cos^(-1)(1-x^(2))/(1+x^(2))]=(2x)/(1-x^(2))],[*c)]

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