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How to integrate 1/(x^2+1)

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    how do I intergate
    1/(x2 + 1)
    using C4 maths?
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    (Original post by ilovemath)
    how do I intergate
    1/(x2 + 1)
    using C4 maths?
    Let x = tan(u)

    Are you sure this is the question because I don't think these substitutions are used in A-level (not further) Maths.
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    (Original post by ilovemath)
    how do I intergate
    1/(x2 + 1)
    using C4 maths?
    Trig substitution. sec^2x=tan^x+1
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    (Original post by hassi94)
    Let x = tan(u)

    Are you sure this is the question because I don't think these substitutions are used in A-level (not further) Maths.
    well it mentions it in by book but does nto solve it....

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