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

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1. how do I intergate
1/(x2 + 1)
using C4 maths?
2. (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.
3. (Original post by ilovemath)
how do I intergate
1/(x2 + 1)
using C4 maths?
Trig substitution. sec^2x=tan^x+1
4. (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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