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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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