Primitive of Reciprocal of Root of a squared minus x squared/Examples/16 - x^2

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

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

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

The result follows by setting $a = 4$.