Hopefully someone can help me understand the solution to the following integral which is the final step in a problem I'm looking at:
$\phi(x)$ is the probability density function of a Standard Normal and $\Phi(x)$ the distribution function. Obviously $\Phi(x)$ is the integral of $\int\phi(x)dx$ but I don't follow the first step in the evaluation of the above integral. The solution it's trivial. If anyone could explain the above it would be appreciated.