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(2x+3y)²=4x²+12xy+9y²
b)
(5a-2b)=25a²-20ab+4b²
c)
(-7x-4y)²=49x²+56xy+16y²
d)
[(a+b)=1]²
[a+b-1]²=a²+b²+1+2ab-2a-2b