integrate 4 * 1/(x ^ 2 + 4x + 20) dx
Added by Menard V.
Step 1
The expression x^2 + 4x + 20 can be rewritten as (x + 2)^2 + 16. So, the integral becomes ∫4/( (x + 2)^2 + 16 ) dx. This is a standard form of integral, which is ∫du/(u^2 + a^2) = 1/a * arctan(u/a) + C. Show more…
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