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      Question

      Solve:  ∫[2x/(x4+1)]

      dx
      A sin^-1 x^2 + c Correct Answer Incorrect Answer
      B tan^-1 x^2 + c Correct Answer Incorrect Answer
      C cot^-1 x^2 + c Correct Answer Incorrect Answer
      D cos^-1 x^2 + c Correct Answer Incorrect Answer

      Solution

      Let x2 = t and 2x dx = dt => ∫[dt/(t2+1)] dt => tan-1(t) + c => tan-1 x2 + c

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