Polygon abcd is reflected across line l to form alblcldl. what is the relationship between line l and ccl?

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Sorry guys but as you have a small brain

16 more than the product of 5 and p