Use the guide to find the specific step where you got stuck, then close it and finish the problem on your own.
Unification of Electric and Magnetic fields.
The is to an engineering student what a spotter is to a weightlifter: it prevents failure during heavy lifts but does not do the lifting for you. By methodically working through Hayt’s challenging problems with the aid of verified, step-by-step solutions, you develop the vector intuition and field visualization skills that separate competent engineers from those who simply survived the course.
For the more complex problems where the answers aren't in the back:
Wave propagation on guided structures.