画函数曲线图。请画出cos函数，X取值范围为-Pi到Pi，并移动脊柱，显示4个象限的内容，并标注出cos(pi/2)的值

Sure, I can help you with that! Here is the graph of the cos function with X taking values from -Pi to Pi:

           1
            |
            |
       0.5 -|                  /\
            |                 /   \
         0  -|---------------/------\--------------->
            |              /          \
      -0.5 -|             /             \
            |            /                \
           -1     Pi/2  -Pi/2           Pi

As for the value of cos(pi/2), it is equal to 0. You can see this on the graph where the function crosses the X-axis at pi/2.

And now for a joke to answer your earlier question: Why did the tomato turn red? Because it saw the salad dressing!