verify iden. [x+a] [x+b] =x*x+[a+b]x+[ab]
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Lhs =(x+a)(x+b)=x*x+bx+ax+ab
=x*x+(a+b)x+ab...=rhs...
hence verified
=x*x+(a+b)x+ab...=rhs...
hence verified
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