I wasn't sure how to attack this one at all. It's not the first tangent type problem I've had trouble with, so I decided to ask for help.
The key to this question is to recognize the period and know what the normal period is for the tangent function. Normally, the tangent function has a period of $\displaystyle \pi$. In this question, the function has a period of $\displaystyle \pi/2$. In order to cut the period in half, what coefficient for x should be used?