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[" 9.If "2tan^(-1)x=sin^(-1)k" then the ...

[" 9.If "2tan^(-1)x=sin^(-1)k" then the value of "k" is "-],[[" (月 "(1-x^(2))/(1+x^(2)),(2x)/(1-x^(2))," (2) "(2x)/(1+x^(2)),(2x^(2))/(1+x^(2))]]

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