To solve this expression, we need to calculate the values of each trigonometric function at the given angles:

sin$pi$ = 0
cos$pi$ = -1
tan$pi$ = 0
cot$3pi/2$ = 0

Now we can substitute these values into the expression:

4 sin$pi$ cos$pi$ + tan$pi$ - cot$3pi/2$ = 4 0 $-1$ + 0 - 0
= 0

Therefore, the value of the expression is 0.