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[" 41.समीकरण "tan^(-1)(1+x)+tan^(-1)(1-x...

[" 41.समीकरण "tan^(-1)(1+x)+tan^(-1)(1-x)=(pi)/(2)" Of "],[[" (a) "x=1," (b) "x=-1," (c) "x=0," (d) "x=pi]]

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