value of 2ab when a+b whole square equals to (a square+2ab+b square)
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see whatever values of a and b is given multiply them with2 and youmwill get your value
if you ask why 2ab then (a+b)(a+b)
=a²+ab+ba+b2
ab+ab=2ab
that's where from the formula derived as a²+2ab+b²
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