(m-3)²(m+3)²(m²+9)²sd!

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(m-3)²(m+3)²(m²+9)²sd!
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(m-3)²(m+3)²(m²+9)²sd!
(m-3)²(m+3)²(m²+9)²
sd!

(m-3)²(m+3)²(m²+9)²sd!
(m-3)²(m+3)²(m²+9)²
=(m²-9)²(m²+9)²
=(m^4-81)²
=m^8-162m^4+6561