>>11458531b=a
a(a-b)=(a+b)(a-b)
a*0=(a+b)*0
0=0
p.s.: The division by zero doesn't make sense.
1/1=1
1/0.1=10
1/0.01=100
1/0.001=1000
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1/0=infinity
But:
1/-1=-1
1/-0.1=-10
1/-0.01=-100
1/-0.001=-1000
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1/0=-infinity
Infinity isn't -infinity.
