49x²-9x²=
=(7x)²-(3y)²
=7x-3y
....
16x⁴-9y⁴=
=(4x²-3y²)*(4x²+3y²)
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49x²-9x²=
=(7x)²-(3y)²
=7x-3y
....
16x⁴-9y⁴=
=(4x²-3y²)*(4x²+3y²)