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( f(x) = x ), ( g(x) = cos x^2 ) হলে— i. ( int 2 f(x) dx = 2 ln x + c ) ii. ( int_ 0 ^ 1 2xg(x)dx = pi 2 ) iii. ( g'(x) = -2x sin x^2 ) নিচের কোনটি সঠিক? | Suva Ai