题目

It was summer, and my dad wanted to treat me to a vacation like never before. He decided to take me on a trip to the Wild West.We took a plane to Albuquerque, a big city in the state of New Mexico. We reached Albuquerque in the late afternoon. Uncle Paul, my dad’s friend, picked us up from the airport and drove us up to his farm in Pecos.His wife Tina cooked us a delicious dinner and we got to know his sons Ryan and Kyle. My dad and I spent the night in the guestroom of the farm house listening to the frogs and water rolling down the river nearby. Very early in the morning, Uncle Paul woke u已知角的终边经过点P(4 , －3)，则的值等于           .