50/
A=(4x-3)(4x+3)
B=(7-5y)(7+5y)
C=(7x-6y)(7x+6y)
D=(1-8x)(1+8x)
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50/
A=(4x-3)(4x+3)
B=(7-5y)(7+5y)
C=(7x-6y)(7x+6y)
D=(1-8x)(1+8x)