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

how do I intergate
1/(x² + 1)
using C4 maths?

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.

how do I intergate
1/(x² + 1)
using C4 maths?

Trig substitution. sec^2x=tan^x+1

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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