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( f(x) = sin^ -1 2x 1+x^2 ) এবং ( g(x) = tan^ -1 ( tan x) ) হলে— i. ( f'(x) = 2 1+x^2 ) ii. ( g'(x) = 1 x ) iii. ( f left(1 3 right) = pi 3 ) নিচের কোনটি সঠিক? | Suva Ai