1.    when(x<-5,1,0) + when(x>-5 and x<-1,-x/2-3/2,0) + when(x>-1 and x<3,x,6-x)

2.    (x+7)*sin(x+7)/5

3.    625x^4/194481-25x^2/196+1/2

4.    3e ^((-x-7)/5)*cos(x)

(Return to Project #22.)