MAYBE
0.08/0.18	MAYBE
0.08/0.18	
0.08/0.18	Problem:
0.08/0.18	 D(t()) -> 1()
0.08/0.18	 D(constant()) -> 0()
0.08/0.18	 D(+(x,y)) -> +(D(x),D(y))
0.08/0.18	 D(*(x,y)) -> +(*(y,D(x)),*(x,D(y)))
0.08/0.18	 D(-(x,y)) -> -(D(x),D(y))
0.08/0.18	 D(minus(x)) -> minus(D(x))
0.08/0.18	 D(div(x,y)) -> -(div(D(x),y),div(*(x,D(y)),pow(y,2())))
0.08/0.18	 D(ln(x)) -> div(D(x),x)
0.08/0.18	 D(pow(x,y)) -> +(*(*(y,pow(x,-(y,1()))),D(x)),*(*(pow(x,y),ln(x)),D(y)))
0.08/0.18	
0.08/0.18	Proof:
0.08/0.18	 Open
0.08/0.18	EOF