(3x-2y)(3x+2y)(9x^2+4y^2)
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=>(3x-2y)(3x+2y)(9x²+4y²)
=>(3x)²-(2y)²(9x²+4y²)
=>(9x²-4y²)(9x²+4y²)
=>(9x²)²-(4y²)²
=>81x⁴-16x⁴
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