证明行列式
a^2(a+1)^2(a+2)^2(a+3)^2
b^2(b+1)^2(b+2)^2(b+3)^2
c^2(c+1)^2(c+2)^2(c+3)^2=0
d^2(d+1)^2(d+2)^2(d+3)^2