prove:(a+b)²-(a-b)²=4ab
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(a2+b2+2ab) - (a2+b2-2ab)
a2+b2+2ab -a2-b2+2ab
=4ab
Coz a2 and b2 will be cancelled becoz of different signs
a2+b2+2ab -a2-b2+2ab
=4ab
Coz a2 and b2 will be cancelled becoz of different signs
absolutely correct
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