Primitive of Reciprocal of x squared plus a squared/Examples/16 + x^2

Example of Use of Primitive of $\dfrac 1 {x^2 + a^2}$

 * $\ds \int \dfrac 1 {16 + x^2} \rd x = \dfrac 1 4 \arctan \dfrac x 4 + C$

Proof
From Primitive of $\dfrac 1 {x^2 + a^2}$:

The result follows by setting $a = 4$.